Return reference from styleEngine() accessor.

Source/core/dom/shadow/ShadowRoot.cpp

 /*
  * Copyright (C) 2011 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.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 53 matching lines @@
 
 ShadowRoot::~ShadowRoot()
 {
 #if !ENABLE(OILPAN)
     ASSERT(!m_prev);
     ASSERT(!m_next);
 
     if (m_shadowRootRareData && m_shadowRootRareData->styleSheets())
         m_shadowRootRareData->styleSheets()->detachFromDocument();
 
-    document().styleEngine()->didRemoveShadowRoot(this);
+    document().styleEngine().didRemoveShadowRoot(this);
 
     // We cannot let ContainerNode destructor call willBeDeletedFromDocument()
     // for this ShadowRoot instance because TreeScope destructor
     // clears Node::m_treeScope thus ContainerNode is no longer able
     // to access it Document reference after that.
     willBeDeletedFromDocument();
 
     // We must remove all of our children first before the TreeScope destructor
     // runs so we don't go through TreeScopeAdopter for each child with a
     // destructed tree scope in each descendant.
@@ skipping 84 matching lines @@
         root->addChildShadowRoot();
         m_registeredWithParentShadowRoot = true;
     }
 
     return InsertionDone;
 }
 
 void ShadowRoot::removedFrom(ContainerNode* insertionPoint)
 {
     if (insertionPoint->inDocument()) {
-        document().styleEngine()->shadowRootRemovedFromDocument(this);
+        document().styleEngine().shadowRootRemovedFromDocument(this);
         if (m_registeredWithParentShadowRoot) {
             ShadowRoot* root = host()->containingShadowRoot();
             if (!root)
                 root = insertionPoint->containingShadowRoot();
             if (root)
                 root->removeChildShadowRoot();
             m_registeredWithParentShadowRoot = false;
         }
     }
 
@@ skipping 132 matching lines @@
 DEFINE_TRACE(ShadowRoot)
 {
     visitor->trace(m_prev);
     visitor->trace(m_next);
     visitor->trace(m_shadowRootRareData);
     TreeScope::trace(visitor);
     DocumentFragment::trace(visitor);
 }
 
 }