Oilpan: make DOMWindowProperty a GC mixin.

Source/modules/screen_orientation/ScreenOrientation.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ScreenOrientation_h
 #define ScreenOrientation_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/events/EventTarget.h"
 #include "core/frame/DOMWindowProperty.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebScreenOrientationType.h"
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class ExecutionContext;
 class LocalFrame;
 class ScriptPromise;
 class ScriptState;
 class ScreenOrientationController;
 
 class ScreenOrientation FINAL
     : public RefCountedGarbageCollectedWillBeGarbageCollectedFinalized<ScreenOrientation>
     , public EventTargetWithInlineData
-    , DOMWindowProperty {
+    , public DOMWindowProperty {
     DEFINE_EVENT_TARGET_REFCOUNTING_WILL_BE_REMOVED(RefCountedGarbageCollectedWillBeGarbageCollectedFinalized<ScreenOrientation>);
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ScreenOrientation);
 public:
     static ScreenOrientation* create(LocalFrame*);
 
     virtual ~ScreenOrientation();
 
     // EventTarget implementation.
     virtual const WTF::AtomicString& interfaceName() const OVERRIDE;
@@ skipping 20 matching lines @@
 
     ScreenOrientationController* controller();
 
     WebScreenOrientationType m_type;
     unsigned short m_angle;
 };
 
 } // namespace blink
 
 #endif // ScreenOrientation_h