Revert "Plumb PinchVirtualViewport layers into CC."

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index c7782a14fdd97ab82bbce26f4692e08ddb5fe073..c89f6fdcd6a467313fc3fc2f6968d32533667668 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -489,27 +489,6 @@ void RenderWidgetCompositor::registerForAnimations(WebKit::WebLayer* layer) {
       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,