sync compositor: Remove begin frame source

content/renderer/android/synchronous_compositor_filter.h

Index: content/renderer/android/synchronous_compositor_filter.h
diff --git a/content/renderer/android/synchronous_compositor_filter.h b/content/renderer/android/synchronous_compositor_filter.h
index c8f159e66d9e42f1c99b16d1f78fb082705cf25b..fce425324f210e7bc5b59045ae2345ccf3f9cfd1 100644
--- a/content/renderer/android/synchronous_compositor_filter.h
+++ b/content/renderer/android/synchronous_compositor_filter.h
@@ -53,12 +53,6 @@ class SynchronousCompositorFilter
   void UnregisterOutputSurface(
       int routing_id,
       SynchronousCompositorOutputSurface* output_surface) override;
-  void RegisterBeginFrameSource(int routing_id,
-                                SynchronousCompositorExternalBeginFrameSource*
-                                    begin_frame_source) override;
-  void UnregisterBeginFrameSource(int routing_id,
-                                  SynchronousCompositorExternalBeginFrameSource*
-                                      begin_frame_source) override;
 
   // InputHandlerManagerClient overrides.
   void SetBoundHandler(const Handler& handler) override;
@@ -108,7 +102,6 @@ class SynchronousCompositorFilter
 
   bool filter_ready_;
   struct Entry {
-    SynchronousCompositorExternalBeginFrameSource* begin_frame_source;
     SynchronousCompositorOutputSurface* output_surface;
     ui::SynchronousInputHandlerProxy* synchronous_input_handler_proxy;