Revert of [android] Make RWHVAndroid a BeginFrameObserver.

ui/android/window_android_observer.h

Index: ui/android/window_android_observer.h
diff --git a/ui/android/window_android_observer.h b/ui/android/window_android_observer.h
index 0a07fd84385383537d3d24c8de98bd05248f133a..bb750dec6fbd944aa7e30cbac61495b87c3f7ff1 100644
--- a/ui/android/window_android_observer.h
+++ b/ui/android/window_android_observer.h
@@ -15,6 +15,8 @@
   virtual void OnRootWindowVisibilityChanged(bool visible) = 0;
   virtual void OnAttachCompositor() = 0;
   virtual void OnDetachCompositor() = 0;
+  virtual void OnVSync(base::TimeTicks frame_time,
+                       base::TimeDelta vsync_period) = 0;
   virtual void OnAnimate(base::TimeTicks frame_begin_time) {}
 
   // Note that activity state callbacks will only be made if the WindowAndroid