cros: Remove unused a11y partial screen magnifier code

The partial screen ("lens") magnifier accessibility feature was
deprioritized in 2013 and never shipped. Removing the code eliminates
ash-to-chrome delegate methods, which we need to do for go/mustash.

Bug: 170850, 594887
Test: ash_unittests, chrome browser_tests
Change-Id: I258761fbecedc5d6ebfe888e08a19756a2371566
Reviewed-on: https://chromium-review.googlesource.com/636347
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#498468}

ash/accessibility_delegate.h

@@ -33,15 +33,9 @@ class ASH_EXPORT AccessibilityDelegate {
   // Invoked to enable the screen magnifier.
   virtual void SetMagnifierEnabled(bool enabled) = 0;
 
-  // Invoked to change the type of the screen magnifier.
-  virtual void SetMagnifierType(MagnifierType type) = 0;
-
   // Returns true if the screen magnifier is enabled.
   virtual bool IsMagnifierEnabled() const = 0;
 
-  // Returns the current screen magnifier mode.
-  virtual MagnifierType GetMagnifierType() const = 0;
-
   // Invoked to enable Large Cursor.
   virtual void SetLargeCursorEnabled(bool enabled) = 0;
 

ash/accessibility_types.h

@@ -24,14 +24,12 @@ enum AccessibilityAlert {
 
 // Note: Do not change these values; UMA and prefs depend on them.
 enum MagnifierType {
+  MAGNIFIER_DISABLED = 0,  // Used by enterprise policy.
   MAGNIFIER_FULL = 1,
-  MAGNIFIER_PARTIAL = 2,
+  // Never shipped. Deprioritized in 2013. http://crbug.com/170850
+  // MAGNIFIER_PARTIAL = 2,
 };
 
-const int kMaxMagnifierType = 2;
-
-const MagnifierType kDefaultMagnifierType = MAGNIFIER_FULL;
-
 // Factor of magnification scale. For example, when this value is 1.189, scale
 // value will be changed x1.000, x1.189, x1.414, x1.681, x2.000, ...
 // Note: this value is 2.0 ^ (1 / 4).

ash/default_accessibility_delegate.cc

@@ -28,18 +28,10 @@ void DefaultAccessibilityDelegate::SetMagnifierEnabled(bool enabled) {
   screen_magnifier_enabled_ = enabled;
 }
 
-void DefaultAccessibilityDelegate::SetMagnifierType(MagnifierType type) {
-  screen_magnifier_type_ = type;
-}
-
 bool DefaultAccessibilityDelegate::IsMagnifierEnabled() const {
   return screen_magnifier_enabled_;
 }
 
-MagnifierType DefaultAccessibilityDelegate::GetMagnifierType() const {
-  return screen_magnifier_type_;
-}
-
 void DefaultAccessibilityDelegate::SetLargeCursorEnabled(bool enabled) {
   large_cursor_enabled_ = enabled;
 }

ash/default_accessibility_delegate.h

@@ -21,9 +21,7 @@ class ASH_EXPORT DefaultAccessibilityDelegate : public AccessibilityDelegate {
   void ToggleHighContrast() override;
   bool IsHighContrastEnabled() const override;
   void SetMagnifierEnabled(bool enabled) override;
-  void SetMagnifierType(MagnifierType type) override;
   bool IsMagnifierEnabled() const override;
-  MagnifierType GetMagnifierType() const override;
   void SetLargeCursorEnabled(bool enabled) override;
   bool IsLargeCursorEnabled() const override;
   void SetAutoclickEnabled(bool enabled) override;
@@ -66,7 +64,6 @@ class ASH_EXPORT DefaultAccessibilityDelegate : public AccessibilityDelegate {
   bool spoken_feedback_enabled_ = false;
   bool high_contrast_enabled_ = false;
   bool screen_magnifier_enabled_ = false;
-  MagnifierType screen_magnifier_type_ = kDefaultMagnifierType;
   bool large_cursor_enabled_ = false;
   bool autoclick_enabled_ = false;
   bool virtual_keyboard_enabled_ = false;
@@ -79,6 +76,7 @@ class ASH_EXPORT DefaultAccessibilityDelegate : public AccessibilityDelegate {
   bool select_to_speak_enabled_ = false;
   bool switch_access_enabled_ = false;
   AccessibilityAlert accessibility_alert_ = A11Y_ALERT_NONE;
+
   DISALLOW_COPY_AND_ASSIGN(DefaultAccessibilityDelegate);
 };
 

ash/public/cpp/ash_pref_names.cc

@@ -32,6 +32,7 @@ const char kAccessibilityScreenMagnifierCenterFocus[] =
 // An integer pref which determines what type of screen magnifier is enabled.
 // Note that: 'screen_magnifier_type' had been used as string pref. Hence,
 // we are using another name pref here.
+// NOTE: We only shipped one type (full). http://crbug.com/170850
 const char kAccessibilityScreenMagnifierType[] =
     "settings.a11y.screen_magnifier_type2";
 // A double pref which determines a zooming scale of the screen magnifier.

chrome/browser/chromeos/accessibility/accessibility_manager.cc

@@ -158,17 +158,6 @@ AccessibilityStatusEventDetails::AccessibilityStatusEventDetails(
     ash::AccessibilityNotificationVisibility notify)
     : notification_type(notification_type),
       enabled(enabled),
-      magnifier_type(ash::kDefaultMagnifierType),
-      notify(notify) {}
-
-AccessibilityStatusEventDetails::AccessibilityStatusEventDetails(
-    AccessibilityNotificationType notification_type,
-    bool enabled,
-    ash::MagnifierType magnifier_type,
-    ash::AccessibilityNotificationVisibility notify)
-    : notification_type(notification_type),
-      enabled(enabled),
-      magnifier_type(magnifier_type),
       notify(notify) {}
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -1383,12 +1372,8 @@ void AccessibilityManager::UpdateChromeOSAccessibilityHistograms() {
                         IsVirtualKeyboardEnabled());
   UMA_HISTOGRAM_BOOLEAN("Accessibility.CrosStickyKeys", IsStickyKeysEnabled());
   if (MagnificationManager::Get()) {
-    uint32_t type = MagnificationManager::Get()->IsMagnifierEnabled()
-                        ? MagnificationManager::Get()->GetMagnifierType()
-                        : 0;
-    // '0' means magnifier is disabled.
-    UMA_HISTOGRAM_ENUMERATION("Accessibility.CrosScreenMagnifier", type,
-                              ash::kMaxMagnifierType + 1);
+    UMA_HISTOGRAM_BOOLEAN("Accessibility.CrosScreenMagnifier",
+                          MagnificationManager::Get()->IsMagnifierEnabled());
   }
   if (profile_) {
     const PrefService* const prefs = profile_->GetPrefs();

chrome/browser/chromeos/accessibility/accessibility_manager.h

@@ -62,15 +62,8 @@ struct AccessibilityStatusEventDetails {
       bool enabled,
       ash::AccessibilityNotificationVisibility notify);
 
-  AccessibilityStatusEventDetails(
-      AccessibilityNotificationType notification_type,
-      bool enabled,
-      ash::MagnifierType magnifier_type,
-      ash::AccessibilityNotificationVisibility notify);
-
   AccessibilityNotificationType notification_type;
   bool enabled;
-  ash::MagnifierType magnifier_type;
   ash::AccessibilityNotificationVisibility notify;
 };
 

chrome/browser/chromeos/accessibility/magnification_manager.cc

@@ -44,11 +44,8 @@ class MagnificationManagerImpl
       : profile_(NULL),
         magnifier_enabled_pref_handler_(
             ash::prefs::kAccessibilityScreenMagnifierEnabled),
-        magnifier_type_pref_handler_(
-            ash::prefs::kAccessibilityScreenMagnifierType),
         magnifier_scale_pref_handler_(
             ash::prefs::kAccessibilityScreenMagnifierScale),
-        type_(ash::kDefaultMagnifierType),
         enabled_(false),
         keep_focus_centered_(false),
         observing_focus_change_in_page_(false) {
@@ -70,8 +67,6 @@ class MagnificationManagerImpl
   // MagnificationManager implimentation:
   bool IsMagnifierEnabled() const override { return enabled_; }
 
-  ash::MagnifierType GetMagnifierType() const override { return type_; }
-
   void SetMagnifierEnabled(bool enabled) override {
     if (!profile_)
       return;
@@ -82,15 +77,6 @@ class MagnificationManagerImpl
     prefs->CommitPendingWrite();
   }
 
-  void SetMagnifierType(ash::MagnifierType type) override {
-    if (!profile_)
-      return;
-
-    PrefService* prefs = profile_->GetPrefs();
-    prefs->SetInteger(ash::prefs::kAccessibilityScreenMagnifierType, type);
-    prefs->CommitPendingWrite();
-  }
-
   void SaveScreenMagnifierScale(double scale) override {
     if (!profile_)
       return;
@@ -127,10 +113,6 @@ class MagnificationManagerImpl
           ash::prefs::kAccessibilityScreenMagnifierEnabled,
           base::Bind(&MagnificationManagerImpl::UpdateMagnifierFromPrefs,
                      base::Unretained(this)));
-      pref_change_registrar_->Add(
-          ash::prefs::kAccessibilityScreenMagnifierType,
-          base::Bind(&MagnificationManagerImpl::UpdateMagnifierFromPrefs,
-                     base::Unretained(this)));
       pref_change_registrar_->Add(
           ash::prefs::kAccessibilityScreenMagnifierCenterFocus,
           base::Bind(&MagnificationManagerImpl::UpdateMagnifierFromPrefs,
@@ -138,7 +120,6 @@ class MagnificationManagerImpl
     }
 
     magnifier_enabled_pref_handler_.HandleProfileChanged(profile_, profile);
-    magnifier_type_pref_handler_.HandleProfileChanged(profile_, profile);
     magnifier_scale_pref_handler_.HandleProfileChanged(profile_, profile);
 
     profile_ = profile;
@@ -156,20 +137,8 @@ class MagnificationManagerImpl
 
     enabled_ = enabled;
 
-    if (type_ == ash::MAGNIFIER_FULL) {
-      ash::Shell::Get()->magnification_controller()->SetEnabled(enabled_);
-      MonitorFocusInPageChange();
-    } else {
-      ash::Shell::Get()->partial_magnification_controller()->SetEnabled(
-          enabled_);
-    }
-  }
-
-  virtual void SetMagnifierTypeInternal(ash::MagnifierType type) {
-    if (type_ == type)
-      return;
-
-    type_ = ash::MAGNIFIER_FULL;  // (leave out for full magnifier)
+    ash::Shell::Get()->magnification_controller()->SetEnabled(enabled_);
+    MonitorFocusInPageChange();
   }
 
   virtual void SetMagniferKeepFocusCenteredInternal(bool keep_focus_centered) {
@@ -178,10 +147,8 @@ class MagnificationManagerImpl
 
     keep_focus_centered_ = keep_focus_centered;
 
-    if (type_ == ash::MAGNIFIER_FULL) {
       ash::Shell::Get()->magnification_controller()->SetKeepFocusCentered(
           keep_focus_centered_);
-    }
   }
 
   void UpdateMagnifierFromPrefs() {
@@ -190,34 +157,19 @@ class MagnificationManagerImpl
 
     const bool enabled = profile_->GetPrefs()->GetBoolean(
         ash::prefs::kAccessibilityScreenMagnifierEnabled);
-    const int type_integer = profile_->GetPrefs()->GetInteger(
-        ash::prefs::kAccessibilityScreenMagnifierType);
     const bool keep_focus_centered = profile_->GetPrefs()->GetBoolean(
         ash::prefs::kAccessibilityScreenMagnifierCenterFocus);
 
-    ash::MagnifierType type = ash::kDefaultMagnifierType;
-    if (type_integer > 0 && type_integer <= ash::kMaxMagnifierType) {
-      type = static_cast<ash::MagnifierType>(type_integer);
-    } else if (type_integer == 0) {
-      // Type 0 is used to disable the screen magnifier through policy. As the
-      // magnifier type is irrelevant in this case, it is OK to just fall back
-      // to the default.
-    } else {
-      NOTREACHED();
-    }
-
     if (!enabled) {
       SetMagnifierEnabledInternal(enabled);
-      SetMagnifierTypeInternal(type);
       SetMagniferKeepFocusCenteredInternal(keep_focus_centered);
     } else {
       SetMagniferKeepFocusCenteredInternal(keep_focus_centered);
-      SetMagnifierTypeInternal(type);
       SetMagnifierEnabledInternal(enabled);
     }
 
     AccessibilityStatusEventDetails details(
-        ACCESSIBILITY_TOGGLE_SCREEN_MAGNIFIER, enabled_, type_,
+        ACCESSIBILITY_TOGGLE_SCREEN_MAGNIFIER, enabled_,
         ash::A11Y_NOTIFICATION_NONE);
 
     if (AccessibilityManager::Get()) {
@@ -283,10 +235,8 @@ class MagnificationManagerImpl
   Profile* profile_;
 
   AccessibilityManager::PrefHandler magnifier_enabled_pref_handler_;
-  AccessibilityManager::PrefHandler magnifier_type_pref_handler_;
   AccessibilityManager::PrefHandler magnifier_scale_pref_handler_;
 
-  ash::MagnifierType type_;
   bool enabled_;
   bool keep_focus_centered_;
   bool observing_focus_change_in_page_;

chrome/browser/chromeos/accessibility/magnification_manager.h

@@ -5,7 +5,6 @@
 #ifndef CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_MAGNIFICATION_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_MAGNIFICATION_MANAGER_H_
 
-#include "ash/accessibility_types.h"
 #include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
 
 class Profile;
@@ -20,12 +19,9 @@ namespace chromeos {
 //     desktop.
 //   - Watch change of the pref. When the pref changes, the setting of the
 //     magnifier will interlock with it.
-
 class MagnificationManager {
  public:
-  // Creates an instance of MagnificationManager. This should be called once,
-  // Returns the existing instance. If there is no instance, creates one.
-  // because only one instance should exist at the same time.
+  // Creates an instance of MagnificationManager. This should be called once.
   static void Initialize();
 
   // Deletes the existing instance of MagnificationManager.
@@ -37,15 +33,9 @@ class MagnificationManager {
   // Returns if the screen magnifier is enabled.
   virtual bool IsMagnifierEnabled() const = 0;
 
-  // Returns the current type of the screen magnifier.
-  virtual ash::MagnifierType GetMagnifierType() const = 0;
-
   // Enables the screen magnifier.
   virtual void SetMagnifierEnabled(bool enabled) = 0;
 
-  // Changes the type of the screen magnifier.
-  virtual void SetMagnifierType(ash::MagnifierType type) = 0;
-
   // Saves the magnifier scale to the pref.
   virtual void SaveScreenMagnifierScale(double scale) = 0;
 

chrome/browser/chromeos/accessibility/magnification_manager_browsertest.cc

@@ -39,10 +39,6 @@ void SetMagnifierEnabled(bool enabled) {
   MagnificationManager::Get()->SetMagnifierEnabled(enabled);
 }
 
-void SetMagnifierType(ash::MagnifierType type) {
-  MagnificationManager::Get()->SetMagnifierType(type);
-}
-
 void SetFullScreenMagnifierScale(double scale) {
   ash::Shell::Get()->magnification_controller()->SetScale(scale, false);
 }
@@ -59,10 +55,6 @@ double GetSavedFullScreenMagnifierScale() {
   return MagnificationManager::Get()->GetSavedScreenMagnifierScale();
 }
 
-ash::MagnifierType GetMagnifierType() {
-  return MagnificationManager::Get()->GetMagnifierType();
-}
-
 bool IsMagnifierEnabled() {
   return MagnificationManager::Get()->IsMagnifierEnabled();
 }
@@ -122,10 +114,7 @@ void StartUserSession(const AccountId& account_id) {
 
 class MockMagnificationObserver {
  public:
-  MockMagnificationObserver() : observed_(false),
-                                observed_enabled_(false),
-                                magnifier_type_(-1)
-  {
+  MockMagnificationObserver() {
     AccessibilityManager* accessibility_manager = AccessibilityManager::Get();
     CHECK(accessibility_manager);
     accessibility_subscription_ = accessibility_manager->RegisterCallback(
@@ -137,7 +126,6 @@ class MockMagnificationObserver {
 
   bool observed() const { return observed_; }
   bool observed_enabled() const { return observed_enabled_; }
-  int magnifier_type() const { return magnifier_type_; }
 
   void reset() { observed_ = false; }
 
@@ -145,15 +133,13 @@ class MockMagnificationObserver {
   void OnAccessibilityStatusChanged(
       const AccessibilityStatusEventDetails& details) {
     if (details.notification_type == ACCESSIBILITY_TOGGLE_SCREEN_MAGNIFIER) {
-      magnifier_type_ = details.magnifier_type;
       observed_enabled_ = details.enabled;
       observed_ = true;
     }
   }
 
-  bool observed_;
-  bool observed_enabled_;
-  int magnifier_type_;
+  bool observed_ = false;
+  bool observed_enabled_ = false;
 
   std::unique_ptr<AccessibilityStatusSubscription> accessibility_subscription_;
 
@@ -215,7 +201,6 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginOffToOff) {
   SetMagnifierEnabled(true);
   // Confirms that magnifier is enabled.
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
   EXPECT_TRUE(GetScreenMagnifierEnabledFromPref());
 }
 
@@ -233,10 +218,8 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginFullToOff) {
 
   // Enables magnifier on login screen.
   SetMagnifierEnabled(true);
-  SetMagnifierType(ash::MAGNIFIER_FULL);
   SetFullScreenMagnifierScale(2.5);
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
   EXPECT_EQ(2.5, GetFullScreenMagnifierScale());
 
   // Logs in (but the session is not started yet).
@@ -245,7 +228,6 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginFullToOff) {
 
   // Confirms that magnifier is keeping enabled.
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 
   StartUserSession(test_account_id_);
 
@@ -281,7 +263,6 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginOffToFull) {
   // Confirms that the magnifier is enabled and configured according to the
   // explicitly set prefs just after session start.
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
   EXPECT_EQ(2.5, GetFullScreenMagnifierScale());
   EXPECT_TRUE(GetScreenMagnifierEnabledFromPref());
 }
@@ -298,11 +279,9 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, PRE_LoginFullToFull) {
 
 IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginFullToFull) {
   // Enables magnifier on login screen.
-  SetMagnifierType(ash::MAGNIFIER_FULL);
   SetMagnifierEnabled(true);
   SetFullScreenMagnifierScale(3.0);
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
   EXPECT_EQ(3.0, GetFullScreenMagnifierScale());
 
   // Logs in (but the session is not started yet).
@@ -311,14 +290,12 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginFullToFull) {
 
   // Confirms that magnifier is keeping enabled.
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 
   StartUserSession(test_account_id_);
 
   // Confirms that the magnifier is enabled and configured according to the
   // explicitly set prefs just after session start.
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
   EXPECT_EQ(2.5, GetFullScreenMagnifierScale());
   EXPECT_TRUE(GetScreenMagnifierEnabledFromPref());
 }
@@ -330,10 +307,8 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, PRE_LoginFullToUnset) {
 
 IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginFullToUnset) {
   // Enables full screen magnifier.
-  SetMagnifierType(ash::MAGNIFIER_FULL);
   SetMagnifierEnabled(true);
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 
   // Logs in (but the session is not started yet).
   session_manager::SessionManager::Get()->CreateSession(test_account_id_,
@@ -341,7 +316,6 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginFullToUnset) {
 
   // Confirms that magnifier is keeping enabled.
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 
   StartUserSession(test_account_id_);
 
@@ -373,11 +347,9 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginAsNewUserOff) {
 
 IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginAsNewUserFull) {
   // Enables magnifier on login screen.
-  SetMagnifierType(ash::MAGNIFIER_FULL);
   SetMagnifierEnabled(true);
   SetFullScreenMagnifierScale(2.5);
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
   EXPECT_EQ(2.5, GetFullScreenMagnifierScale());
 
   // Logs in (but the session is not started yet).
@@ -386,13 +358,11 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginAsNewUserFull) {
 
   // Confirms that magnifier is keeping enabled.
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 
   StartUserSession(test_account_id_);
 
   // Confirms that magnifier keeps enabled.
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
   EXPECT_EQ(2.5, GetFullScreenMagnifierScale());
   EXPECT_TRUE(GetScreenMagnifierEnabledFromPref());
 }
@@ -415,63 +385,6 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginAsNewUserUnset) {
   EXPECT_FALSE(GetScreenMagnifierEnabledFromPref());
 }
 
-IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, ChangeMagnifierType) {
-  // Enables/disables full screen magnifier.
-  SetMagnifierEnabled(false);
-  SetMagnifierType(ash::MAGNIFIER_FULL);
-  EXPECT_FALSE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
-
-  SetMagnifierEnabled(true);
-  EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
-
-  SetMagnifierEnabled(false);
-  EXPECT_FALSE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
-
-  // Enables/disables partial screen magnifier.
-  SetMagnifierType(ash::MAGNIFIER_PARTIAL);
-  EXPECT_FALSE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
-
-  SetMagnifierEnabled(true);
-  EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
-
-  SetMagnifierEnabled(false);
-  EXPECT_FALSE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
-
-  // Changes the magnifier type when the magnifier is enabled.
-  SetMagnifierType(ash::MAGNIFIER_FULL);
-  SetMagnifierEnabled(true);
-  EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
-
-  SetMagnifierType(ash::MAGNIFIER_PARTIAL);
-  EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
-
-  SetMagnifierType(ash::MAGNIFIER_FULL);
-  EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
-
-  // Changes the magnifier type when the magnifier is disabled.
-  SetMagnifierEnabled(false);
-  SetMagnifierType(ash::MAGNIFIER_FULL);
-  EXPECT_FALSE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
-
-  SetMagnifierType(ash::MAGNIFIER_PARTIAL);
-  EXPECT_FALSE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
-
-  SetMagnifierType(ash::MAGNIFIER_FULL);
-  EXPECT_FALSE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
-}
-
 IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, TypePref) {
   // Logs in
   session_manager::SessionManager::Get()->CreateSession(test_account_id_,
@@ -486,7 +399,6 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, TypePref) {
   SetScreenMagnifierEnabledPref(true);
   // Confirms that magnifier is enabled.
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 }
 
 IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, ScalePref) {
@@ -497,10 +409,8 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, ScalePref) {
   SetSavedFullScreenMagnifierScale(2.5);
 
   // Enables full screen magnifier.
-  SetMagnifierType(ash::MAGNIFIER_FULL);
   SetMagnifierEnabled(true);
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 
   // Confirms that 2.5x is restored.
   EXPECT_EQ(2.5, GetFullScreenMagnifierScale());
@@ -519,10 +429,8 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, InvalidScalePref) {
   SetSavedFullScreenMagnifierScale(0.5);
 
   // Enables full screen magnifier.
-  SetMagnifierType(ash::MAGNIFIER_FULL);
   SetMagnifierEnabled(true);
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 
   // Confirms that the actual scale is set to the minimum scale.
   EXPECT_EQ(1.0, GetFullScreenMagnifierScale());
@@ -537,31 +445,25 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, InvalidScalePref) {
   // Enables full screen magnifier.
   SetMagnifierEnabled(true);
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 
   // Confirms that the actual scale is set to the maximum scale.
   EXPECT_EQ(4.0, GetFullScreenMagnifierScale());
 }
 
-IN_PROC_BROWSER_TEST_F(MagnificationManagerTest,
-                       ChangingTypeInvokesNotification) {
+IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, MagnificationObserver) {
   MockMagnificationObserver observer;
 
   EXPECT_FALSE(observer.observed());
 
   // Set full screen magnifier, and confirm the observer is called.
   SetMagnifierEnabled(true);
-  SetMagnifierType(ash::MAGNIFIER_FULL);
   EXPECT_TRUE(observer.observed());
   EXPECT_TRUE(observer.observed_enabled());
-  EXPECT_EQ(observer.magnifier_type(), ash::MAGNIFIER_FULL);
-  EXPECT_EQ(GetMagnifierType(), ash::MAGNIFIER_FULL);
   observer.reset();
 
   // Set full screen magnifier again, and confirm the observer is not called.
-  SetMagnifierType(ash::MAGNIFIER_FULL);
+  SetMagnifierEnabled(true);
   EXPECT_FALSE(observer.observed());
-  EXPECT_EQ(GetMagnifierType(), ash::MAGNIFIER_FULL);
   observer.reset();
 }
 

chrome/browser/chromeos/accessibility/magnification_manager_unittest.cc

@@ -25,20 +25,12 @@ bool IsMagnifierEnabled() {
   return MagnificationManager::Get()->IsMagnifierEnabled();
 }
 
-ash::MagnifierType GetMagnifierType() {
-  return MagnificationManager::Get()->GetMagnifierType();
-}
-
-void SetMagnifierType(ash::MagnifierType type) {
-  return MagnificationManager::Get()->SetMagnifierType(type);
-}
-
 }  // namespace
 
 class MagnificationManagerTest : public ash::AshTestBase {
  public:
-  MagnificationManagerTest() {
-  }
+  MagnificationManagerTest() = default;
+  ~MagnificationManagerTest() override = default;
 
   void SetUp() override {
     ash::AshTestBase::SetUp();
@@ -55,22 +47,14 @@ class MagnificationManagerTest : public ash::AshTestBase {
   TestingProfile profile_;
 };
 
-TEST_F(MagnificationManagerTest, ChangeType) {
+TEST_F(MagnificationManagerTest, EnableDisable) {
   // Set full screen magnifier, and confirm the status is set successfully.
   EnableMagnifier();
-  SetMagnifierType(ash::MAGNIFIER_FULL);
   EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(GetMagnifierType(), ash::MAGNIFIER_FULL);
-
-  // Set partial screen magnifier, and confirm the change is ignored.
-  SetMagnifierType(ash::MAGNIFIER_PARTIAL);
-  EXPECT_TRUE(IsMagnifierEnabled());
-  EXPECT_EQ(GetMagnifierType(), ash::MAGNIFIER_FULL);
 
   // Disables magnifier, and confirm the status is set successfully.
   DisableMagnifier();
   EXPECT_FALSE(IsMagnifierEnabled());
-  EXPECT_EQ(GetMagnifierType(), ash::MAGNIFIER_FULL);
 }
 
 }  // namespace chromeos

chrome/browser/chromeos/policy/configuration_policy_handler_chromeos.cc

@@ -339,7 +339,7 @@ void PinnedLauncherAppsPolicyHandler::ApplyList(
 
 ScreenMagnifierPolicyHandler::ScreenMagnifierPolicyHandler()
     : IntRangePolicyHandlerBase(key::kScreenMagnifierType,
-                                0,
+                                ash::MAGNIFIER_DISABLED,
                                 ash::MAGNIFIER_FULL,
                                 false) {}
 
@@ -353,7 +353,7 @@ void ScreenMagnifierPolicyHandler::ApplyPolicySettings(
   int value_in_range;
   if (value && EnsureInRange(value, &value_in_range, NULL)) {
     prefs->SetBoolean(ash::prefs::kAccessibilityScreenMagnifierEnabled,
-                      value_in_range != 0);
+                      value_in_range != ash::MAGNIFIER_DISABLED);
     prefs->SetInteger(ash::prefs::kAccessibilityScreenMagnifierType,
                       value_in_range);
   }

chrome/browser/chromeos/policy/login_screen_default_policy_browsertest.cc

@@ -333,7 +333,6 @@ IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyLoginScreenBrowsertest,
       chromeos::MagnificationManager::Get();
   ASSERT_TRUE(magnification_manager);
   EXPECT_TRUE(magnification_manager->IsMagnifierEnabled());
-  EXPECT_EQ(ash::MAGNIFIER_FULL, magnification_manager->GetMagnifierType());
 }
 
 IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyInSessionBrowsertest,
@@ -434,8 +433,6 @@ IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyInSessionBrowsertest,
       chromeos::MagnificationManager::Get();
   ASSERT_TRUE(magnification_manager);
   EXPECT_FALSE(magnification_manager->IsMagnifierEnabled());
-  EXPECT_EQ(ash::kDefaultMagnifierType,
-            magnification_manager->GetMagnifierType());
 }
 
 IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyLoginScreenBrowsertest,

chrome/browser/chromeos/preferences.cc

@@ -200,7 +200,7 @@ void Preferences::RegisterProfilePrefs(
       ash::prefs::kAccessibilityScreenMagnifierEnabled, false,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
   registry->RegisterIntegerPref(
-      ash::prefs::kAccessibilityScreenMagnifierType, ash::kDefaultMagnifierType,
+      ash::prefs::kAccessibilityScreenMagnifierType, ash::MAGNIFIER_FULL,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
   registry->RegisterDoublePref(ash::prefs::kAccessibilityScreenMagnifierScale,
                                std::numeric_limits<double>::min());

chrome/browser/policy/configuration_policy_handler_list_factory.cc

@@ -1037,8 +1037,8 @@ std::unique_ptr<ConfigurationPolicyHandlerList> BuildHandlerList(
   handlers->AddHandler(base::MakeUnique<IntRangePolicyHandler>(
       key::kUptimeLimit, prefs::kUptimeLimit, 3600, INT_MAX, true));
   handlers->AddHandler(base::WrapUnique(new IntRangePolicyHandler(
-      key::kDeviceLoginScreenDefaultScreenMagnifierType, NULL, 0,
-      ash::MAGNIFIER_FULL, false)));
+      key::kDeviceLoginScreenDefaultScreenMagnifierType, nullptr,
+      ash::MAGNIFIER_DISABLED, ash::MAGNIFIER_FULL, false)));
   // TODO(binjin): Remove LegacyPoliciesDeprecatingPolicyHandler for these two
   // policies once deprecation of legacy power management policies is done.
   // http://crbug.com/346229

chrome/browser/policy/policy_browsertest.cc

@@ -2873,9 +2873,7 @@ IN_PROC_BROWSER_TEST_F(PolicyTest, ScreenMagnifierTypeNone) {
       chromeos::MagnificationManager::Get();
 
   // Manually enable the full-screen magnifier.
-  magnification_manager->SetMagnifierType(ash::MAGNIFIER_FULL);
   magnification_manager->SetMagnifierEnabled(true);
-  EXPECT_EQ(ash::MAGNIFIER_FULL, magnification_manager->GetMagnifierType());
   EXPECT_TRUE(magnification_manager->IsMagnifierEnabled());
 
   // Verify that policy overrides the manual setting.
@@ -2905,7 +2903,6 @@ IN_PROC_BROWSER_TEST_F(PolicyTest, ScreenMagnifierTypeFull) {
                POLICY_SCOPE_USER, POLICY_SOURCE_CLOUD,
                base::MakeUnique<base::Value>(ash::MAGNIFIER_FULL), nullptr);
   UpdateProviderPolicy(policies);
-  EXPECT_EQ(ash::MAGNIFIER_FULL, magnification_manager->GetMagnifierType());
   EXPECT_TRUE(magnification_manager->IsMagnifierEnabled());
 
   // Verify that the screen magnifier cannot be disabled manually anymore.

chrome/browser/ui/ash/ash_init.cc

@@ -9,7 +9,6 @@
 #include "ash/accessibility_types.h"
 #include "ash/high_contrast/high_contrast_controller.h"
 #include "ash/magnifier/magnification_controller.h"
-#include "ash/magnifier/partial_magnification_controller.h"
 #include "ash/mus/bridge/shell_port_mash.h"
 #include "ash/mus/window_manager.h"
 #include "ash/public/cpp/config.h"
@@ -123,14 +122,8 @@ AshInit::AshInit() {
       chromeos::AccessibilityManager::Get()->IsHighContrastEnabled());
 
   DCHECK(chromeos::MagnificationManager::Get());
-  bool magnifier_enabled =
-      chromeos::MagnificationManager::Get()->IsMagnifierEnabled();
-  ash::MagnifierType magnifier_type =
-      chromeos::MagnificationManager::Get()->GetMagnifierType();
   shell->magnification_controller()->SetEnabled(
-      magnifier_enabled && magnifier_type == ash::MAGNIFIER_FULL);
-  shell->partial_magnification_controller()->SetEnabled(
-      magnifier_enabled && magnifier_type == ash::MAGNIFIER_PARTIAL);
+      chromeos::MagnificationManager::Get()->IsMagnifierEnabled());
 
   if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableZeroBrowsersOpenForTests)) {

chrome/browser/ui/ash/chrome_shell_delegate.cc

@@ -140,21 +140,11 @@ class AccessibilityDelegateImpl : public ash::AccessibilityDelegate {
     return chromeos::MagnificationManager::Get()->SetMagnifierEnabled(enabled);
   }
 
-  void SetMagnifierType(ash::MagnifierType type) override {
-    DCHECK(chromeos::MagnificationManager::Get());
-    return chromeos::MagnificationManager::Get()->SetMagnifierType(type);
-  }
-
   bool IsMagnifierEnabled() const override {
     DCHECK(chromeos::MagnificationManager::Get());
     return chromeos::MagnificationManager::Get()->IsMagnifierEnabled();
   }
 
-  ash::MagnifierType GetMagnifierType() const override {
-    DCHECK(chromeos::MagnificationManager::Get());
-    return chromeos::MagnificationManager::Get()->GetMagnifierType();
-  }
-
   void SetLargeCursorEnabled(bool enabled) override {
     DCHECK(AccessibilityManager::Get());
     return AccessibilityManager::Get()->EnableLargeCursor(enabled);