Oilpan: turn DOMWindow into a heap supplementable.

Source/core/frame/DOMWindow.h

Index: Source/core/frame/DOMWindow.h
diff --git a/Source/core/frame/DOMWindow.h b/Source/core/frame/DOMWindow.h
index 95e5310466cf664349fc524b1a7daf3b6b8e1ab5..d36a75e7be5569f3ccf9f39a8921e1ca98c9fbee 100644
--- a/Source/core/frame/DOMWindow.h
+++ b/Source/core/frame/DOMWindow.h
@@ -91,7 +91,8 @@ enum PageshowEventPersistence {
 
     enum SetLocationLocking { LockHistoryBasedOnGestureState, LockHistoryAndBackForwardList };
 
-    class DOMWindow FINAL : public RefCountedWillBeRefCountedGarbageCollected<DOMWindow>, public ScriptWrappable, public EventTargetWithInlineData, public FrameDestructionObserver, public Supplementable<DOMWindow>, public LifecycleContext<DOMWindow> {
+    class DOMWindow FINAL : public RefCountedWillBeRefCountedGarbageCollected<DOMWindow>, public ScriptWrappable, public EventTargetWithInlineData, public FrameDestructionObserver, public WillBeHeapSupplementable<DOMWindow>, public LifecycleContext<DOMWindow> {
+        WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DOMWindow);
         DEFINE_EVENT_TARGET_REFCOUNTING(RefCountedWillBeRefCountedGarbageCollected<DOMWindow>);
     public:
         static PassRefPtr<Document> createDocument(const String& mimeType, const DocumentInit&, bool forceXHTML);