Remove offscreen compositor contexts.

content/browser/renderer_host/compositor_impl_android.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/browser/renderer_host/compositor_impl_android.h"
 
 #include <android/bitmap.h>
 #include <android/native_window_jni.h>
 
 #include "base/android/jni_android.h"
@@ skipping 472 matching lines @@
   }
 
   return scoped_ptr<cc::OutputSurface>(
       new OutputSurfaceWithoutParent(context_provider));
 }
 
 void CompositorImpl::OnLostResources() {
   client_->DidLoseResources();
 }
 
-scoped_refptr<cc::ContextProvider> CompositorImpl::OffscreenContextProvider() {
-  // There is no support for offscreen contexts, or compositor filters that
-  // would require them in this compositor instance. If they are needed,
-  // then implement a context provider that provides contexts from
-  // ImageTransportSurfaceAndroid.
-  return NULL;
-}
-
 void CompositorImpl::DidCompleteSwapBuffers() {
   client_->OnSwapBuffersCompleted();
 }
 
 void CompositorImpl::ScheduleComposite() {
   client_->ScheduleComposite();
 }
 
 void CompositorImpl::ScheduleAnimation() {
   ScheduleComposite();
@@ skipping 11 matching lines @@
 
 void CompositorImpl::DidCommit() {
   root_window_->OnCompositingDidCommit();
 }
 
 void CompositorImpl::AttachLayerForReadback(scoped_refptr<cc::Layer> layer) {
   root_layer_->AddChild(layer);
 }
 
 }  // namespace content