Remove offscreen compositor contexts.

content/renderer/gpu/render_widget_compositor.cc

 // Copyright (c) 2013 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/gpu/render_widget_compositor.h"
 
 #include <limits>
 #include <string>
 
 #if defined(OS_ANDROID)
@@ skipping 610 matching lines @@
 void RenderWidgetCompositor::DidCommitAndDrawFrame() {
   widget_->didCommitAndDrawCompositorFrame();
 }
 
 void RenderWidgetCompositor::DidCompleteSwapBuffers() {
   widget_->didCompleteSwapBuffers();
   if (!threaded_)
     widget_->OnSwapBuffersComplete();
 }
 
-scoped_refptr<cc::ContextProvider>
-RenderWidgetCompositor::OffscreenContextProvider() {
-  return RenderThreadImpl::current()->OffscreenCompositorContextProvider();
-}
-
 void RenderWidgetCompositor::ScheduleComposite() {
   if (!suppress_schedule_composite_)
     widget_->scheduleComposite();
 }
 
 void RenderWidgetCompositor::ScheduleAnimation() {
   widget_->scheduleAnimation();
 }
 
 void RenderWidgetCompositor::DidPostSwapBuffers() {
   widget_->OnSwapBuffersPosted();
 }
 
 void RenderWidgetCompositor::DidAbortSwapBuffers() {
   widget_->OnSwapBuffersAborted();
 }
 
 void RenderWidgetCompositor::RateLimitSharedMainThreadContext() {
   cc::ContextProvider* provider =
       RenderThreadImpl::current()->SharedMainThreadContextProvider().get();
   provider->ContextGL()->RateLimitOffscreenContextCHROMIUM();
 }
 
 }  // namespace content