Change PaintLayer::m_layoutObject to a reference.

third_party/WebKit/Source/core/paint/PaintLayerResourceInfo.cpp

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. 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.
@@ skipping 25 matching lines @@
 
 PaintLayerResourceInfo::PaintLayerResourceInfo(PaintLayer* layer)
     : m_layer(layer) {}
 
 PaintLayerResourceInfo::~PaintLayerResourceInfo() {
   DCHECK(!m_layer);
 }
 
 TreeScope* PaintLayerResourceInfo::treeScope() {
   DCHECK(m_layer);
-  Node* node = m_layer->layoutObject()->node();
+  Node* node = m_layer->layoutObject().node();
   return node ? &node->treeScope() : nullptr;
 }
 
 void PaintLayerResourceInfo::resourceContentChanged() {
   DCHECK(m_layer);
-  LayoutObject* layoutObject = m_layer->layoutObject();
-  layoutObject->setShouldDoFullPaintInvalidation();
+  LayoutObject& layoutObject = m_layer->layoutObject();
+  layoutObject.setShouldDoFullPaintInvalidation();
   // The effect paint property nodes depend on SVG filters so we need
   // to update these properties when filter resources change.
-  layoutObject->setNeedsPaintPropertyUpdate();
-  const ComputedStyle& style = layoutObject->styleRef();
+  layoutObject.setNeedsPaintPropertyUpdate();
+  const ComputedStyle& style = layoutObject.styleRef();
   if (style.hasFilter() && style.filter().hasReferenceFilter())
     invalidateFilterChain();
 }
 
 void PaintLayerResourceInfo::resourceElementChanged() {
   DCHECK(m_layer);
-  LayoutObject* layoutObject = m_layer->layoutObject();
-  layoutObject->setShouldDoFullPaintInvalidation();
+  LayoutObject& layoutObject = m_layer->layoutObject();
+  layoutObject.setShouldDoFullPaintInvalidation();
   // The effect paint property nodes depend on SVG filters so we need
   // to update these properties when filter resources change.
-  layoutObject->setNeedsPaintPropertyUpdate();
-  const ComputedStyle& style = layoutObject->styleRef();
+  layoutObject.setNeedsPaintPropertyUpdate();
+  const ComputedStyle& style = layoutObject.styleRef();
   if (style.hasFilter() && style.filter().hasReferenceFilter())
     invalidateFilterChain();
 }
 
 void PaintLayerResourceInfo::setLastEffect(FilterEffect* lastEffect) {
   m_lastEffect = lastEffect;
 }
 
 FilterEffect* PaintLayerResourceInfo::lastEffect() const {
   return m_lastEffect;
 }
 
 void PaintLayerResourceInfo::invalidateFilterChain() {
   m_lastEffect = nullptr;
 }
 
 DEFINE_TRACE(PaintLayerResourceInfo) {
   visitor->trace(m_lastEffect);
   SVGResourceClient::trace(visitor);
 }
 
 }  // namespace blink