Oilpan: make DOMWindowProperty a GC mixin.

Source/core/storage/Storage.cpp

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 28 matching lines @@
 }
 
 Storage::Storage(LocalFrame* frame, PassOwnPtrWillBeRawPtr<StorageArea> storageArea)
     : DOMWindowProperty(frame)
     , m_storageArea(storageArea)
 {
     ASSERT(m_frame);
     ASSERT(m_storageArea);
 }
 
-Storage::~Storage()
-{
-}
+DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(Storage);
 
 String Storage::anonymousIndexedGetter(unsigned index, ExceptionState& exceptionState)
 {
     return anonymousNamedGetter(AtomicString::number(index), exceptionState);
 }
 
 String Storage::anonymousNamedGetter(const AtomicString& name, ExceptionState& exceptionState)
 {
     bool found = contains(name, exceptionState);
     if (exceptionState.hadException() || !found)
@@ skipping 58 matching lines @@
         return false;
     bool found = contains(name, exceptionState);
     if (exceptionState.hadException() || !found)
         return false;
     return true;
 }
 
 void Storage::trace(Visitor* visitor)
 {
     visitor->trace(m_storageArea);
+    DOMWindowProperty::trace(visitor);
 }
 
 }