Removing GL context rate limiting feature and related wrappers

cc/trees/thread_proxy.h

Index: cc/trees/thread_proxy.h
diff --git a/cc/trees/thread_proxy.h b/cc/trees/thread_proxy.h
index 35db6fc3a7a65f5aabb75ceb65ee5aa8b319e6e3..1c8bd8b36a82a1c44880eee819438ccba6067a01 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/thread_proxy.h
@@ -172,7 +172,6 @@ class CC_EXPORT ThreadProxy : public Proxy,
   void MainThreadHasStoppedFlinging() override;
   void Start() override;
   void Stop() override;
-  void ForceSerializeOnSwapBuffers() override;
   bool SupportsImplScrolling() const override;
   bool MainFrameWillHappenForTesting() override;
   void SetChildrenNeedBeginFrames(bool children_need_begin_frames) override;
@@ -277,7 +276,6 @@ class CC_EXPORT ThreadProxy : public Proxy,
   void FinishGLOnImplThread(CompletionEvent* completion);
   void LayerTreeHostClosedOnImplThread(CompletionEvent* completion);
   DrawResult DrawSwapInternal(bool forced_draw);
-  void ForceSerializeOnSwapBuffersOnImplThread(CompletionEvent* completion);
   void MainFrameWillHappenOnImplThreadForTesting(CompletionEvent* completion,
                                                  bool* main_frame_will_happen);
   void SetSwapUsedIncompleteTileOnImplThread(bool used_incomplete_tile);