Remove external begin frame source parameter and settings

cc/trees/remote_channel_main.cc

 // 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.
 
 #include "cc/trees/remote_channel_main.h"
 
 #include <memory>
 
 #include "base/memory/ptr_util.h"
 #include "cc/proto/base_conversions.h"
@@ skipping 201 matching lines @@
   // LayerTreeHostClient::DidCommit and stay consistent with the
   // behaviour in the threaded compositor.
   MainThreadTaskRunner()->PostTask(
       FROM_HERE, base::Bind(&RemoteChannelMain::DidCommitAndDrawFrame,
                             weak_factory_.GetWeakPtr()));
 
   completion->Signal();
 }
 
 void RemoteChannelMain::SynchronouslyInitializeImpl(
-    LayerTreeHostInProcess* layer_tree_host,
-    std::unique_ptr<BeginFrameSource> external_begin_frame_source) {
+    LayerTreeHostInProcess* layer_tree_host) {
   TRACE_EVENT0("cc.remote", "RemoteChannelMain::SynchronouslyInitializeImpl");
   DCHECK(!initialized_);
 
   initialized_ = true;
 }
 
 void RemoteChannelMain::SynchronouslyCloseImpl() {
   TRACE_EVENT0("cc.remote", "RemoteChannelMain::SynchronouslyCloseImpl");
   DCHECK(initialized_);
 
@@ skipping 36 matching lines @@
 
 void RemoteChannelMain::DidCompleteSwapBuffers() {
   proxy_main_->DidCompleteSwapBuffers();
 }
 
 base::SingleThreadTaskRunner* RemoteChannelMain::MainThreadTaskRunner() const {
   return task_runner_provider_->MainThreadTaskRunner();
 }
 
 }  // namespace cc