Revert "Plumb PinchVirtualViewport layers into CC."

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>
 
 #include "base/command_line.h"
@@ skipping 471 matching lines @@
 void RenderWidgetCompositor::didStopFlinging() {
   layer_tree_host_->DidStopFlinging();
 }
 
 void RenderWidgetCompositor::registerForAnimations(WebKit::WebLayer* layer) {
   cc::Layer* cc_layer = static_cast<webkit::WebLayerImpl*>(layer)->layer();
   cc_layer->layer_animation_controller()->SetAnimationRegistrar(
       layer_tree_host_->animation_registrar());
 }
 
-void RenderWidgetCompositor::registerViewportLayers(
-    const WebKit::WebLayer* pageScaleLayer,
-    const WebKit::WebLayer* innerViewportScrollLayer,
-    const WebKit::WebLayer* outerViewportScrollLayer) {
-  layer_tree_host_->RegisterViewportLayers(
-      static_cast<const webkit::WebLayerImpl*>(pageScaleLayer)->layer(),
-      static_cast<const webkit::WebLayerImpl*>(innerViewportScrollLayer)
-          ->layer(),
-      // The outer viewport layer will only exist when using pinch virtual
-      // viewports.
-      outerViewportScrollLayer ? static_cast<const webkit::WebLayerImpl*>(
-                                     outerViewportScrollLayer)->layer()
-                               : NULL);
-}
-
-void RenderWidgetCompositor::clearViewportLayers() {
-  layer_tree_host_->RegisterViewportLayers(scoped_refptr<cc::Layer>(),
-                                           scoped_refptr<cc::Layer>(),
-                                           scoped_refptr<cc::Layer>());
-}
-
 bool RenderWidgetCompositor::compositeAndReadback(
     void *pixels, const WebRect& rect_in_device_viewport) {
   return layer_tree_host_->CompositeAndReadback(pixels,
                                                 rect_in_device_viewport);
 }
 
 void RenderWidgetCompositor::finishAllRendering() {
   layer_tree_host_->FinishAllRendering();
 }
 
@@ skipping 92 matching lines @@
   return RenderThreadImpl::current()->OffscreenContextProviderForMainThread();
 }
 
 scoped_refptr<cc::ContextProvider>
 RenderWidgetCompositor::OffscreenContextProviderForCompositorThread() {
   return RenderThreadImpl::current()->
       OffscreenContextProviderForCompositorThread();
 }
 
 }  // namespace content