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

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 74 matching lines @@
     // destructed tree scope in each descendant.
     removeDetachedChildren();
 
     // We must call clearRareData() here since a ShadowRoot class inherits TreeScope
     // as well as Node. See a comment on TreeScope.h for the reason.
     if (hasRareData())
         clearRareData();
 #endif
 }
 
+#if !ENABLE(OILPAN)
 void ShadowRoot::dispose()
 {
-#if !ENABLE(OILPAN)
     removeDetachedChildren();
+}
 #endif
-}
 
 ShadowRoot* ShadowRoot::olderShadowRootForBindings() const
 {
     ShadowRoot* older = olderShadowRoot();
     while (older && !older->shouldExposeToBindings())
         older = older->olderShadowRoot();
     ASSERT(!older || older->shouldExposeToBindings());
     return older;
 }
 
@@ skipping 229 matching lines @@
 void ShadowRoot::trace(Visitor* visitor)
 {
     visitor->trace(m_prev);
     visitor->trace(m_next);
     visitor->trace(m_shadowRootRareData);
     TreeScope::trace(visitor);
     DocumentFragment::trace(visitor);
 }
 
 }