Get rid of compositing and squashing helper methods on RenderLayerModelObject.

Source/core/rendering/compositing/RenderLayerCompositor.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 234 matching lines @@
 #endif
 
 void RenderLayerCompositor::applyOverlayFullscreenVideoAdjustment()
 {
     m_inOverlayFullscreenVideo = false;
     if (!m_rootContentLayer)
         return;
 
     bool isMainFrame = m_renderView.frame()->isMainFrame();
     RenderVideo* video = findFullscreenVideoRenderer(m_renderView.document());
-    if (!video || !video->hasCompositedLayerMapping()) {
+    if (!video || !video->layer()->hasCompositedLayerMapping()) {
         if (isMainFrame) {
             GraphicsLayer* backgroundLayer = fixedRootBackgroundLayer();
             if (backgroundLayer && !backgroundLayer->parent())
                 rootFixedBackgroundsChanged();
         }
         return;
     }
 
-    GraphicsLayer* videoLayer = video->compositedLayerMapping()->mainGraphicsLayer();
+    GraphicsLayer* videoLayer = video->layer()->compositedLayerMapping()->mainGraphicsLayer();
 
     // The fullscreen video has layer position equal to its enclosing frame's scroll position because fullscreen container is fixed-positioned.
     // We should reset layer position here since we are going to reattach the layer at the very top level.
     videoLayer->setPosition(IntPoint());
 
     // Only steal fullscreen video layer and clear all other layers if we are the main frame.
     if (!isMainFrame)
         return;
 
     m_rootContentLayer->removeAllChildren();
@@ skipping 933 matching lines @@
     } else if (graphicsLayer == m_scrollLayer.get()) {
         name = "LocalFrame Scrolling Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace WebCore