Remove external begin frame source parameter and settings

cc/trees/proxy_impl.h

 // Copyright 2015 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_PROXY_IMPL_H_
 #define CC_TREES_PROXY_IMPL_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "cc/base/completion_event.h"
 #include "cc/base/delayed_unique_notifier.h"
 #include "cc/input/top_controls_state.h"
 #include "cc/scheduler/scheduler.h"
 #include "cc/trees/channel_impl.h"
 #include "cc/trees/layer_tree_host_impl.h"
 
 namespace cc {
 class LayerTreeHostInProcess;
 
 // This class aggregates all the interactions that the main side of the
 // compositor needs to have with the impl side. It is created and owned by the
 // ChannelImpl implementation. The class lives entirely on the impl thread.
 class CC_EXPORT ProxyImpl : public NON_EXPORTED_BASE(LayerTreeHostImplClient),
                             public NON_EXPORTED_BASE(SchedulerClient) {
  public:
   ProxyImpl(ChannelImpl* channel_impl,
             LayerTreeHostInProcess* layer_tree_host,
-            TaskRunnerProvider* task_runner_provider,
-            std::unique_ptr<BeginFrameSource> external_begin_frame_source);
+            TaskRunnerProvider* task_runner_provider);
   ~ProxyImpl() override;
 
   // Virtual for testing.
   void UpdateTopControlsStateOnImpl(TopControlsState constraints,
                                     TopControlsState current,
                                     bool animate);
   void InitializeCompositorFrameSinkOnImpl(
       CompositorFrameSink* compositor_frame_sink);
   void InitializeMutatorOnImpl(std::unique_ptr<LayerTreeMutator> mutator);
   void MainThreadHasStoppedFlingingOnImpl();
@@ skipping 86 matching lines @@
   // thread.
   bool next_frame_is_newly_committed_frame_;
 
   bool inside_draw_;
   bool input_throttled_until_commit_;
 
   TaskRunnerProvider* task_runner_provider_;
 
   DelayedUniqueNotifier smoothness_priority_expiration_notifier_;
 
-  std::unique_ptr<BeginFrameSource> external_begin_frame_source_;
-
   RenderingStatsInstrumentation* rendering_stats_instrumentation_;
 
   std::unique_ptr<LayerTreeHostImpl> layer_tree_host_impl_;
 
   ChannelImpl* channel_impl_;
 
   // Use accessors instead of this variable directly.
   BlockedMainCommitOnly main_thread_blocked_commit_vars_unsafe_;
   BlockedMainCommitOnly& blocked_main_commit();
 
   DISALLOW_COPY_AND_ASSIGN(ProxyImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROXY_IMPL_H_