Change PaintLayer::m_layoutObject to a reference.

third_party/WebKit/Source/core/inspector/InspectorLayerTreeAgent.cpp

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 230 matching lines @@
 
   gatherGraphicsLayers(rootGraphicsLayer(), layerIdToNodeIdMap, layers,
                        haveBlockingWheelEventHandlers, scrollingLayerId);
   return layers;
 }
 
 void InspectorLayerTreeAgent::buildLayerIdToNodeIdMap(
     PaintLayer* root,
     LayerIdToNodeIdMap& layerIdToNodeIdMap) {
   if (root->hasCompositedLayerMapping()) {
-    if (Node* node = root->layoutObject()->generatingNode()) {
+    if (Node* node = root->layoutObject().generatingNode()) {
       GraphicsLayer* graphicsLayer =
           root->compositedLayerMapping()->childForSuperlayers();
       layerIdToNodeIdMap.set(graphicsLayer->platformLayer()->id(),
                              idForNode(node));
     }
   }
   for (PaintLayer* child = root->firstChild(); child;
        child = child->nextSibling())
     buildLayerIdToNodeIdMap(child, layerIdToNodeIdMap);
-  if (!root->layoutObject()->isLayoutIFrame())
+  if (!root->layoutObject().isLayoutIFrame())
     return;
   FrameView* childFrameView =
-      toFrameView(toLayoutPart(root->layoutObject())->widget());
+      toFrameView(toLayoutPart(root->layoutObject()).widget());
   LayoutViewItem childLayoutViewItem = childFrameView->layoutViewItem();
   if (!childLayoutViewItem.isNull()) {
     if (PaintLayerCompositor* childCompositor =
             childLayoutViewItem.compositor())
       buildLayerIdToNodeIdMap(childCompositor->rootLayer(), layerIdToNodeIdMap);
   }
 }
 
 void InspectorLayerTreeAgent::gatherGraphicsLayers(
     GraphicsLayer* root,
@@ skipping 223 matching lines @@
 }
 
 void InspectorLayerTreeAgent::didRemovePageOverlay(const GraphicsLayer* layer) {
   size_t index = m_pageOverlayLayerIds.find(layer->platformLayer()->id());
   if (index == WTF::kNotFound)
     return;
   m_pageOverlayLayerIds.remove(index);
 }
 
 }  // namespace blink