Oilpan: make DOMWindowProperty a GC mixin.

Source/core/plugins/DOMMimeTypeArray.cpp

 /*
  *  Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *  Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
@@ skipping 15 matching lines @@
 #include "wtf/Vector.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 DOMMimeTypeArray::DOMMimeTypeArray(LocalFrame* frame)
     : DOMWindowProperty(frame)
 {
 }
 
-DOMMimeTypeArray::~DOMMimeTypeArray()
+void DOMMimeTypeArray::trace(Visitor* visitor)
 {
+    DOMWindowProperty::trace(visitor);
 }
 
 unsigned DOMMimeTypeArray::length() const
 {
     PluginData* data = getPluginData();
     if (!data)
         return 0;
     return data->mimes().size();
 }
 
@@ skipping 38 matching lines @@
 {
     if (!m_frame)
         return 0;
     Page* p = m_frame->page();
     if (!p)
         return 0;
     return p->pluginData();
 }
 
 } // namespace blink