Remove external begin frame source parameter and settings

cc/trees/remote_channel_impl.h

 // Copyright 2016 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 CC_TREES_REMOTE_CHANNEL_IMPL_H_
 #define CC_TREES_REMOTE_CHANNEL_IMPL_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "cc/base/cc_export.h"
@@ skipping 69 matching lines @@
  public:
   RemoteChannelImpl(LayerTreeHostInProcess* layer_tree_host,
                     RemoteProtoChannel* remote_proto_channel,
                     TaskRunnerProvider* task_runner_provider);
   ~RemoteChannelImpl() override;
 
   // virtual for testing.
   virtual std::unique_ptr<ProxyImpl> CreateProxyImpl(
       ChannelImpl* channel_impl,
       LayerTreeHostInProcess* layer_tree_host,
-      TaskRunnerProvider* task_runner_provider,
-      std::unique_ptr<BeginFrameSource> external_begin_frame_source);
+      TaskRunnerProvider* task_runner_provider);
 
  private:
   struct MainThreadOnly {
     LayerTreeHostInProcess* layer_tree_host;
     RemoteProtoChannel* remote_proto_channel;
 
     bool started;
 
     // This is set to true if we lost the output surface and can not push any
     // commits to the impl thread.
@@ skipping 36 matching lines @@
   void SetNeedsAnimate() override;
   void SetNeedsUpdateLayers() override;
   void SetNeedsCommit() override;
   void SetNeedsRedraw(const gfx::Rect& damage_rect) override;
   void SetNextCommitWaitsForActivation() override;
   void NotifyInputThrottledUntilCommit() override;
   void SetDeferCommits(bool defer_commits) override;
   void MainThreadHasStoppedFlinging() override;
   bool CommitRequested() const override;
   bool BeginMainFrameRequested() const override;
-  void Start(
-      std::unique_ptr<BeginFrameSource> external_begin_frame_source) override;
+  void Start() override;
   void Stop() override;
   void SetMutator(std::unique_ptr<LayerTreeMutator> mutator) override;
   bool SupportsImplScrolling() const override;
   void UpdateTopControlsState(TopControlsState constraints,
                               TopControlsState current,
                               bool animate) override;
   bool MainFrameWillHappenForTesting() override;
 
   // Called on impl thread.
   // ChannelImpl implementation
@@ skipping 39 matching lines @@
   CompositorThreadOnly compositor_thread_vars_unsafe_;
 
   base::WeakPtr<ProxyImpl> proxy_impl_weak_ptr_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteChannelImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_REMOTE_CHANNEL_IMPL_H_