Removing GL context rate limiting feature and related wrappers

cc/test/fake_proxy.h

Index: cc/test/fake_proxy.h
diff --git a/cc/test/fake_proxy.h b/cc/test/fake_proxy.h
index c809d09036c3d1c673d7122cbf2e4b901c1787ee..62add7a42e0b59d34d63efc42b5fc3bccc9ecbc6 100644
--- a/cc/test/fake_proxy.h
+++ b/cc/test/fake_proxy.h
@@ -41,7 +41,6 @@ class FakeProxy : public Proxy {
   bool CommitRequested() const 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 {}