Oilpan: make DOMWindowProperty a GC mixin.

Source/modules/webmidi/NavigatorWebMIDI.h

 /*
  * Copyright (C) 2013 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 23 matching lines @@
 #include "bindings/core/v8/ScriptPromise.h"
 #include "core/frame/DOMWindowProperty.h"
 #include "modules/webmidi/MIDIOptions.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class Navigator;
 
-class NavigatorWebMIDI FINAL : public NoBaseWillBeGarbageCollectedFinalized<NavigatorWebMIDI>, public WillBeHeapSupplement<Navigator>, public DOMWindowProperty {
+class NavigatorWebMIDI FINAL : public NoBaseWillBeGarbageCollected<NavigatorWebMIDI>, public WillBeHeapSupplement<Navigator>, public DOMWindowProperty {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NavigatorWebMIDI);
+    DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(NavigatorWebMIDI);
 public:
-    virtual ~NavigatorWebMIDI();
     static NavigatorWebMIDI& from(Navigator&);
 
     static ScriptPromise requestMIDIAccess(ScriptState*, Navigator&, const Dictionary&);
     ScriptPromise requestMIDIAccess(ScriptState*, const Dictionary&);
 
-    virtual void trace(Visitor* visitor) OVERRIDE { WillBeHeapSupplement<Navigator>::trace(visitor); }
+    virtual void trace(Visitor*) OVERRIDE;
 
 private:
     NavigatorWebMIDI(LocalFrame*);
     static const char* supplementName();
 };
 
 } // namespace blink
 
 #endif // NavigatorWebMIDI_h