Fix crash from ipc_fuzzer

Can't reproduce original crash so I just fix all crashes I see.

Use WeakPtr in AskUserForSettings callback.

Move chrome::ShowMessageBox in separate task and protection against nested message boxes.

Add missing return into AskUserForSettings.

BUG=472146

Review URL: https://codereview.chromium.org/1083433003

Cr-Commit-Position: refs/heads/master@{#324746}

chrome/browser/printing/print_job_worker.cc

@@ -93,6 +93,13 @@ void NotificationCallback(PrintJobWorkerOwner* print_job,
       content::Details<JobEventDetails>(details));
 }
 
+void PostOnOwnerThread(const scoped_refptr<PrintJobWorkerOwner>& owner,
+                       const PrintingContext::PrintSettingsCallback& callback,
+                       PrintingContext::Result result) {
+  owner->PostTask(FROM_HERE, base::Bind(&HoldRefCallback, owner,
+                                        base::Bind(callback, result)));
+}
+
 }  // namespace
 
 PrintJobWorker::PrintJobWorker(int render_process_id,
@@ -219,21 +226,12 @@ void PrintJobWorker::GetSettingsWithUI(
   }
 #endif
 
+  // weak_factory_ creates pointers valid only on owner_ thread.
   printing_context_->AskUserForSettings(
-      document_page_count,
-      has_selection,
-      is_scripted,
-      base::Bind(&PrintJobWorker::GetSettingsWithUIDone,
-                 base::Unretained(this)));
-}
-
-void PrintJobWorker::GetSettingsWithUIDone(PrintingContext::Result result) {
-  PostTask(FROM_HERE,
-           base::Bind(&HoldRefCallback,
-                      make_scoped_refptr(owner_),
-                      base::Bind(&PrintJobWorker::GetSettingsDone,
-                                 base::Unretained(this),
-                                 result)));
+      document_page_count, has_selection, is_scripted,
+      base::Bind(&PostOnOwnerThread, make_scoped_refptr(owner_),
+                 base::Bind(&PrintJobWorker::GetSettingsDone,
+                            weak_factory_.GetWeakPtr())));
 }
 
 void PrintJobWorker::UseDefaultSettings() {

chrome/browser/printing/print_job_worker.h

@@ -114,11 +114,6 @@ class PrintJobWorker {
       bool has_selection,
       bool is_scripted);
 
-  // The callback used by PrintingContext::GetSettingsWithUI() to notify this
-  // object that the print settings are set.  This is needed in order to bounce
-  // back into the IO thread for GetSettingsDone().
-  void GetSettingsWithUIDone(PrintingContext::Result result);
-
   // Called on the UI thread to update the print settings.
   void UpdatePrintSettings(scoped_ptr<base::DictionaryValue> new_settings);
 

chrome/browser/printing/print_view_manager_base.cc

@@ -4,6 +4,7 @@
 
 #include "chrome/browser/printing/print_view_manager_base.h"
 
+#include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_service.h"
@@ -40,6 +41,18 @@ namespace printing {
 
 namespace {
 
+void ShowWarningMessageBox(const base::string16& message) {
+  // Runs always on the UI thread.
+  static bool is_dialog_shown = false;
+  if (is_dialog_shown)
+    return;
+  // Block opening dialog from nested task.
+  base::AutoReset<bool> auto_reset(&is_dialog_shown, true);
+
+  chrome::ShowMessageBox(nullptr, base::string16(), message,
+                         chrome::MESSAGE_BOX_TYPE_WARNING);
+}
+
 }  // namespace
 
 PrintViewManagerBase::PrintViewManagerBase(content::WebContents* web_contents)
@@ -195,11 +208,10 @@ void PrintViewManagerBase::OnPrintingFailed(int cookie) {
 }
 
 void PrintViewManagerBase::OnShowInvalidPrinterSettingsError() {
-  chrome::ShowMessageBox(NULL,
-                         base::string16(),
-                         l10n_util::GetStringUTF16(
-                             IDS_PRINT_INVALID_PRINTER_SETTINGS),
-                         chrome::MESSAGE_BOX_TYPE_WARNING);
+  base::MessageLoop::current()->PostTask(
+      FROM_HERE, base::Bind(&ShowWarningMessageBox,
+                            l10n_util::GetStringUTF16(
+                                IDS_PRINT_INVALID_PRINTER_SETTINGS)));
 }
 
 void PrintViewManagerBase::DidStartLoading() {

printing/printing_context_system_dialog_win.cc

@@ -69,6 +69,7 @@ void PrintingContextSytemDialogWin::AskUserForSettings(
   if (ShowPrintDialog(&dialog_options) != S_OK) {
     ResetSettings();
     callback.Run(FAILED);
+    return;
   }
 
   // TODO(maruel):  Support PD_PRINTTOFILE.