Oilpan: fix build after r184578.

Source/core/frame/LocalDOMWindow.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 283 matching lines @@
 protected:
     DOMWindowLifecycleNotifier& lifecycleNotifier();
 
 private:
     // Rather than simply inheriting FrameDestructionObserver like most other
     // classes, LocalDOMWindow hides its FrameDestructionObserver with
     // composition. This prevents conflicting overloads between DOMWindow, which
     // has a frame() accessor that returns Frame* for bindings code, and
     // FrameDestructionObserver, which has a frame() accessor that returns a
     // LocalFrame*.
-    class WindowFrameObserver final : public FrameDestructionObserver {
+    class WindowFrameObserver final : public NoBaseWillBeGarbageCollected<WindowFrameObserver>, public FrameDestructionObserver {
+        WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
+        WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(WindowFrameObserver);
+        DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(WindowFrameObserver);
     public:
-        WindowFrameObserver(LocalDOMWindow&, LocalFrame&);
+        static PassOwnPtrWillBeRawPtr<WindowFrameObserver> create(LocalDOMWindow*, LocalFrame&);
+
+        virtual void trace(Visitor*) override;
 
     private:
+        WindowFrameObserver(LocalDOMWindow*, LocalFrame&);
+
         // FrameDestructionObserver overrides:
         void willDetachFrameHost() override;
 
-        LocalDOMWindow& m_window;
+        RawPtrWillBeMember<LocalDOMWindow> m_window;
     };
+    friend WTF::OwnedPtrDeleter<WindowFrameObserver>;
 
     explicit LocalDOMWindow(LocalFrame&);
 
     Page* page();
 
     void clearDocument();
     void willDestroyDocumentInFrame();
 
     // FIXME: Oilpan: the need for this internal method will fall
     // away when EventTargets are no longer using refcounts and
     // window properties are also on the heap. Inline the minimal
     // do-not-broadcast handling then and remove the enum +
     // removeAllEventListenersInternal().
     enum BroadcastListenerRemoval {
         DoNotBroadcastListenerRemoval,
         DoBroadcastListenerRemoval
     };
 
     void willDetachFrameHost();
     void removeAllEventListenersInternal(BroadcastListenerRemoval);
 
-    WindowFrameObserver m_frameObserver;
+    OwnPtrWillBeMember<WindowFrameObserver> m_frameObserver;
     RefPtrWillBeMember<Document> m_document;
 
     bool m_shouldPrintWhenFinishedLoading;
 #if ENABLE(ASSERT)
     bool m_hasBeenReset;
 #endif
 
     WillBeHeapHashSet<RawPtrWillBeWeakMember<DOMWindowProperty> > m_properties;
 
     mutable RefPtrWillBeMember<Screen> m_screen;
@@ skipping 32 matching lines @@
 }
 
 inline String LocalDOMWindow::defaultStatus() const
 {
     return m_defaultStatus;
 }
 
 } // namespace blink
 
 #endif // LocalDOMWindow_h