sync compositor: Remove begin frame source

content/renderer/android/synchronous_compositor_registry.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_REGISTRY_H_
 #define CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_REGISTRY_H_
 
 
 namespace content {
 
-class SynchronousCompositorExternalBeginFrameSource;
 class SynchronousCompositorOutputSurface;
 
 class SynchronousCompositorRegistry {
  public:
   virtual void RegisterOutputSurface(
       int routing_id,
       SynchronousCompositorOutputSurface* output_surface) = 0;
   virtual void UnregisterOutputSurface(
       int routing_id,
       SynchronousCompositorOutputSurface* output_surface) = 0;
-  virtual void RegisterBeginFrameSource(
-      int routing_id,
-      SynchronousCompositorExternalBeginFrameSource* begin_frame_source) = 0;
-  virtual void UnregisterBeginFrameSource(
-      int routing_id,
-      SynchronousCompositorExternalBeginFrameSource* begin_frame_source) = 0;
 
  protected:
   virtual ~SynchronousCompositorRegistry() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_REGISTRY_H_