Revert of Enable BeginFrame scheduling on aura

content/browser/renderer_host/begin_frame_observer_proxy.h

Index: content/browser/renderer_host/begin_frame_observer_proxy.h
diff --git a/content/browser/renderer_host/begin_frame_observer_proxy.h b/content/browser/renderer_host/begin_frame_observer_proxy.h
index 291d8bb8a96c51430de2e55662cbbfcc09a3899a..fd2aa6d7a06f9507033048bfc843906e60c3b719 100644
--- a/content/browser/renderer_host/begin_frame_observer_proxy.h
+++ b/content/browser/renderer_host/begin_frame_observer_proxy.h
@@ -25,8 +25,7 @@
 // This class is used to manage all of the RenderWidgetHostView state and
 // functionality that is associated with BeginFrame message handling.
 class CONTENT_EXPORT BeginFrameObserverProxy
-    : public ui::CompositorBeginFrameObserver,
-      public ui::CompositorObserver {
+    : public ui::CompositorBeginFrameObserver {
  public:
   explicit BeginFrameObserverProxy(BeginFrameObserverProxyClient* client);
   ~BeginFrameObserverProxy() override;
@@ -38,17 +37,6 @@
 
   // Overridden from ui::CompositorBeginFrameObserver:
   void OnSendBeginFrame(const cc::BeginFrameArgs& args) override;
-
-  // Overridden from ui::CompositorObserver:
-  // TODO(simonhong): Stop overriding ui::CompositorObserver. We need to make
-  // sure that this class should be destroyed before ui::Compositor.
-  void OnCompositingDidCommit(ui::Compositor* compositor) override {}
-  void OnCompositingStarted(ui::Compositor* compositor,
-                            base::TimeTicks start_time) override {}
-  void OnCompositingEnded(ui::Compositor* compositor) override {}
-  void OnCompositingAborted(ui::Compositor* compositor) override {}
-  void OnCompositingLockStateChanged(ui::Compositor* compositor) override {}
-  void OnCompositingShuttingDown(ui::Compositor* compositor) override;
 
  private:
   void StartObservingBeginFrames();