Change PaintLayer::m_layoutObject to a reference.

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

 // Copyright 2014 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 "core/inspector/InspectorTraceEvents.h"
 
 #include "bindings/core/v8/ScriptSourceCode.h"
 #include "bindings/core/v8/SourceLocation.h"
 #include "core/animation/Animation.h"
 #include "core/animation/KeyframeEffectReadOnly.h"
@@ skipping 758 matching lines @@
         "Removed the layer from a squashing layer";
 const char InspectorLayerInvalidationTrackingEvent::ReflectionLayerChanged[] =
     "Reflection layer change";
 const char InspectorLayerInvalidationTrackingEvent::NewCompositedLayer[] =
     "Assigned a new composited layer";
 
 std::unique_ptr<TracedValue> InspectorLayerInvalidationTrackingEvent::data(
     const PaintLayer* layer,
     const char* reason) {
   const LayoutObject& paintInvalidationContainer =
-      layer->layoutObject()->containerForPaintInvalidation();
+      layer->layoutObject().containerForPaintInvalidation();
 
   std::unique_ptr<TracedValue> value = TracedValue::create();
   value->setString("frame", toHexString(paintInvalidationContainer.frame()));
   setGeneratingNodeInfo(value.get(), &paintInvalidationContainer, "paintId");
   value->setString("reason", reason);
   return value;
 }
 
 std::unique_ptr<TracedValue> InspectorPaintEvent::data(
     LayoutObject* layoutObject,
@@ skipping 281 matching lines @@
   if (request.move())
     value->setBoolean("move", true);
   if (request.listBased())
     value->setBoolean("listBased", true);
   else if (Node* node = result.innerNode())
     setNodeInfo(value.get(), node, "nodeId", "nodeName");
   return value;
 }
 
 }  // namespace blink