Remove SendBeginFramesToChildren plumbing

cc/trees/proxy_impl.cc

 // 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.
 
 #include "cc/trees/proxy_impl.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/auto_reset.h"
@@ skipping 596 matching lines @@
   layer_tree_host_impl_->PrepareTiles();
 }
 
 void ProxyImpl::ScheduledActionInvalidateOutputSurface() {
   TRACE_EVENT0("cc", "ProxyImpl::ScheduledActionInvalidateOutputSurface");
   DCHECK(IsImplThread());
   DCHECK(layer_tree_host_impl_->output_surface());
   layer_tree_host_impl_->output_surface()->Invalidate();
 }
 
-void ProxyImpl::SendBeginFramesToChildren(const BeginFrameArgs& args) {
-  NOTREACHED() << "Only used by SingleThreadProxy";
-}
-
 void ProxyImpl::SendBeginMainFrameNotExpectedSoon() {
   DCHECK(IsImplThread());
   channel_impl_->BeginMainFrameNotExpectedSoon();
 }
 
 DrawResult ProxyImpl::DrawAndSwapInternal(bool forced_draw) {
   TRACE_EVENT_SYNTHETIC_DELAY("cc.DrawAndSwap");
 
   DCHECK(IsImplThread());
   DCHECK(layer_tree_host_impl_.get());
@@ skipping 59 matching lines @@
 bool ProxyImpl::IsMainThreadBlocked() const {
   return task_runner_provider_->IsMainThreadBlocked();
 }
 
 ProxyImpl::BlockedMainCommitOnly& ProxyImpl::blocked_main_commit() {
   DCHECK(IsMainThreadBlocked() && commit_completion_event_);
   return main_thread_blocked_commit_vars_unsafe_;
 }
 
 }  // namespace cc