cc: Remove BeginFrameSourcesConstructor.

cc/surfaces/onscreen_display_client.h

Index: cc/surfaces/onscreen_display_client.h
diff --git a/cc/surfaces/onscreen_display_client.h b/cc/surfaces/onscreen_display_client.h
index ec147df80af37e56bcf74603ef3d78563a93b027..c2f69f1bf2c7e9163aaf67893d51f448bdb46712 100644
--- a/cc/surfaces/onscreen_display_client.h
+++ b/cc/surfaces/onscreen_display_client.h
@@ -54,14 +54,15 @@ class CC_SURFACES_EXPORT OnscreenDisplayClient
  protected:
   scoped_ptr<OutputSurface> output_surface_;
   scoped_ptr<Display> display_;
-  VSyncParameterObserver* vsync_observer_;
-  scoped_ptr<BeginFrameSource> begin_frame_source_;
+  scoped_ptr<SyntheticBeginFrameSource> synthetic_frame_source_;
+  scoped_ptr<BackToBackBeginFrameSource> unthrottled_frame_source_;
   scoped_ptr<DisplayScheduler> scheduler_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   SurfaceDisplayOutputSurface* surface_display_output_surface_;
   bool output_surface_lost_;
   bool disable_gpu_vsync_;
 
+ private:
   DISALLOW_COPY_AND_ASSIGN(OnscreenDisplayClient);
 };