Clean up legacy IPC code in Ozone(2/3)

OzoneDrmMojo is 100% on. This is 2nd CL to remove more Legacy IPC code in ozone.
Another CL(3/3) will remove ui/ozone/common/gpu/ozone_gpu_message_params.h and related files.

Bug: 620927,806092
Change-Id: Id5cdca9f98677a617a551999d89864f10b753115
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2167765
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kramer Ge <fangzhoug@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763571}

components/viz/host/gpu_host_impl.h

@@ -94,10 +94,6 @@ class VIZ_HOST_EXPORT GpuHostImpl : public mojom::GpuHost {
         mojo::PendingReceiver<service_manager::mojom::Service> receiver) = 0;
 #if defined(USE_OZONE)
     virtual void TerminateGpuProcess(const std::string& message) = 0;
-
-    // TODO(https://crbug.com/806092): Remove this when legacy IPC-based Ozone
-    // is removed.
-    virtual void SendGpuProcessMessage(IPC::Message* message) = 0;
 #endif
 
    protected:

content/browser/gpu/gpu_process_host.cc

@@ -611,10 +611,6 @@ void GpuProcessHost::TerminateGpuProcess(const std::string& message) {
   termination_origin_ = GpuTerminationOrigin::kOzoneWaylandProxy;
   process_->TerminateOnBadMessageReceived(message);
 }
-
-void GpuProcessHost::SendGpuProcessMessage(IPC::Message* message) {
-  Send(message);
-}
 #endif  // defined(USE_OZONE)
 
 // static

content/browser/gpu/gpu_process_host.h

@@ -181,7 +181,6 @@ class GpuProcessHost : public BrowserChildProcessHostDelegate,
       mojo::PendingReceiver<service_manager::mojom::Service> receiver) override;
 #if defined(USE_OZONE)
   void TerminateGpuProcess(const std::string& message) override;
-  void SendGpuProcessMessage(IPC::Message* message) override;
 #endif
 
   bool LaunchGpuProcess();

content/gpu/gpu_child_thread.cc

@@ -41,10 +41,6 @@
 #include "services/viz/privileged/mojom/gl/gpu_service.mojom.h"
 #include "third_party/skia/include/core/SkGraphics.h"
 
-#if defined(USE_OZONE)
-#include "ui/ozone/public/ozone_platform.h"
-#endif
-
 #if defined(OS_ANDROID)
 #include "media/base/android/media_drm_bridge_client.h"
 #include "media/mojo/clients/mojo_android_overlay.h"
@@ -56,13 +52,6 @@ namespace {
 ChildThreadImpl::Options GetOptions() {
   ChildThreadImpl::Options::Builder builder;
 
-#if defined(USE_OZONE)
-  IPC::MessageFilter* message_filter =
-      ui::OzonePlatform::GetInstance()->GetGpuMessageFilter();
-  if (message_filter)
-    builder.AddStartupFilter(message_filter);
-#endif
-
   builder.ConnectToBrowser(true);
   builder.ExposesInterfacesToBrowser();
 

ui/ozone/demo/skia/skia_renderer_factory.cc

@@ -10,6 +10,7 @@
 #include "base/command_line.h"
 #include "ui/gl/gl_surface.h"
 #include "ui/gl/init/gl_factory.h"
+#include "ui/ozone/demo/skia/skia_gl_renderer.h"
 #include "ui/ozone/demo/skia/skia_surfaceless_gl_renderer.h"
 #include "ui/ozone/public/ozone_platform.h"
 #include "ui/ozone/public/platform_window_surface.h"

ui/ozone/demo/skia/skia_renderer_factory.h

@@ -10,7 +10,6 @@
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/ozone/demo/renderer_factory.h"
-#include "ui/ozone/public/ozone_gpu_test_helper.h"
 
 namespace ui {
 

ui/ozone/public/ozone_platform.cc

@@ -78,10 +78,6 @@ const char* OzonePlatform::GetPlatformName() {
   return GetOzonePlatformName();
 }
 
-IPC::MessageFilter* OzonePlatform::GetGpuMessageFilter() {
-  return nullptr;
-}
-
 PlatformClipboard* OzonePlatform::GetPlatformClipboard() {
   // Platforms that support system clipboard must override this method.
   return nullptr;

ui/ozone/public/ozone_platform.h

@@ -22,10 +22,6 @@ namespace display {
 class NativeDisplayDelegate;
 }
 
-namespace IPC {
-class MessageFilter;
-}
-
 namespace ui {
 
 class CursorFactoryOzone;
@@ -131,7 +127,6 @@ class COMPONENT_EXPORT(OZONE) OzonePlatform {
   virtual ui::OverlayManagerOzone* GetOverlayManager() = 0;
   virtual ui::CursorFactoryOzone* GetCursorFactoryOzone() = 0;
   virtual ui::InputController* GetInputController() = 0;
-  virtual IPC::MessageFilter* GetGpuMessageFilter();
   virtual ui::GpuPlatformSupportHost* GetGpuPlatformSupportHost() = 0;
   virtual std::unique_ptr<SystemInputInjector> CreateSystemInputInjector() = 0;
   virtual std::unique_ptr<PlatformWindow> CreatePlatformWindow(