Oilpan: Remove unnecessary trace methods in the supplement hierarchy.

Source/modules/screen_orientation/ScreenOrientationController.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 ScreenOrientationController_h
 #define ScreenOrientationController_h
 
 #include "core/dom/DocumentSupplementable.h"
 #include "public/platform/WebScreenOrientationType.h"
 
 namespace WebCore {
 
 class ScreenOrientationController FINAL : public NoBaseWillBeGarbageCollected<ScreenOrientationController>, public DocumentSupplement {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ScreenOrientationController);
 public:
 #if !ENABLE(OILPAN)
     virtual ~ScreenOrientationController();
 #endif
 
     void didChangeScreenOrientation(blink::WebScreenOrientationType);
 
     blink::WebScreenOrientationType orientation() const { return m_orientation; }
 
     // DocumentSupplement API.
     static ScreenOrientationController& from(Document&);
     static const char* supplementName();
 
-    virtual void trace(Visitor* visitor) OVERRIDE { DocumentSupplement::trace(visitor); }

[haraken, 2014/05/07 12:22:44]

Nit: We'll need this once we make Document& a Member.

-
 private:
     explicit ScreenOrientationController(Document&);
 
     void dispatchOrientationChangeEvent();
 
     Document& m_document;
     blink::WebScreenOrientationType m_orientation;
 };
 
 } // namespace WebCore
 
 #endif // ScreenOrientationController_h