Remove uses of external begin frame sources

content/renderer/render_widget.cc

 // Copyright (c) 2012 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 "content/renderer/render_widget.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 730 matching lines @@
     bool fallback) {
   DCHECK(webwidget_);
   // For widgets that are never visible, we don't start the compositor, so we
   // never get a request for a cc::OutputSurface.
   DCHECK(!compositor_never_visible_);
   return RenderThreadImpl::current()->CreateCompositorOutputSurface(
       fallback, routing_id_, frame_swap_message_queue_,
       GetURLForGraphicsContext3D());
 }
 
-std::unique_ptr<cc::BeginFrameSource>
-RenderWidget::CreateExternalBeginFrameSource() {
-  return compositor_deps_->CreateExternalBeginFrameSource(routing_id_);
-}
-
 void RenderWidget::DidCommitAndDrawCompositorFrame() {
   // NOTE: Tests may break if this event is renamed or moved. See
   // tab_capture_performancetest.cc.
   TRACE_EVENT0("gpu", "RenderWidget::DidCommitAndDrawCompositorFrame");
 
   FOR_EACH_OBSERVER(RenderFrameImpl, render_frames_,
                     DidCommitAndDrawCompositorFrame());
 
   // Notify subclasses that we initiated the paint operation.
   DidInitiatePaint();
@@ skipping 1349 matching lines @@
 void RenderWidget::requestPointerUnlock() {
   mouse_lock_dispatcher_->UnlockMouse(webwidget_mouse_lock_target_.get());
 }
 
 bool RenderWidget::isPointerLocked() {
   return mouse_lock_dispatcher_->IsMouseLockedTo(
       webwidget_mouse_lock_target_.get());
 }
 
 }  // namespace content