Oilpan: cleanup based on review comments after removal of TreeShared.

Source/core/dom/shadow/ElementShadow.cpp

 /*
  * Copyright (C) 2012 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 145 matching lines @@
     ChildNodeInsertionNotifier(shadowHost).notify(*shadowRoot);
     setNeedsDistributionRecalc();
 
     InspectorInstrumentation::didPushShadowRoot(&shadowHost, shadowRoot.get());
 
     ASSERT(m_shadowRoots.head());
     ASSERT(shadowRoot.get() == m_shadowRoots.head());
     return *m_shadowRoots.head();
 }
 
+#if !ENABLE(OILPAN)
 void ElementShadow::removeDetachedShadowRoots()
 {
     // Dont protect this ref count.
     Element* shadowHost = host();
     ASSERT(shadowHost);
 
     while (RefPtr<ShadowRoot> oldRoot = m_shadowRoots.head()) {
         InspectorInstrumentation::willPopShadowRoot(shadowHost, oldRoot.get());
         shadowHost->document().removeFocusedElementOfSubtree(oldRoot.get());
         m_shadowRoots.removeHead();
         oldRoot->setParentOrShadowHostNode(0);
         oldRoot->setParentTreeScope(shadowHost->document());
         oldRoot->setPrev(0);
         oldRoot->setNext(0);
     }
 }
+#endif
 
 void ElementShadow::attach(const Node::AttachContext& context)
 {
     Node::AttachContext childrenContext(context);
     childrenContext.resolvedStyle = 0;
 
     for (ShadowRoot* root = youngestShadowRoot(); root; root = root->olderShadowRoot()) {
         if (root->needsAttach())
             root->attach(childrenContext);
     }
@@ skipping 161 matching lines @@
 
 void ElementShadow::trace(Visitor* visitor)
 {
     // Shadow roots are linked with previous and next pointers which are traced.
     // It is therefore enough to trace one of the shadow roots here and the
     // rest will be traced from there.
     visitor->trace(m_shadowRoots.head());
 }
 
 } // namespace