Include wtf/RefCounted.h less often in modules/

Source/modules/gamepad/WebKitGamepad.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 WebKitGamepad_h
 #define WebKitGamepad_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "modules/gamepad/GamepadCommon.h"
 #include "platform/heap/Handle.h"
-#include "wtf/RefCounted.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class WebKitGamepad FINAL : public GarbageCollectedFinalized<WebKitGamepad>, public GamepadCommon, public ScriptWrappable {
 public:
     static WebKitGamepad* create()
     {
         return new WebKitGamepad();
     }
     ~WebKitGamepad();
 
     typedef Vector<float> FloatVector;
 
     const FloatVector& buttons() const { return m_buttons; }
     void setButtons(unsigned count, const blink::WebGamepadButton* data);
 
     void trace(Visitor*) { }
 
 private:
     WebKitGamepad();
     FloatVector m_buttons;
 };
 
 } // namespace WebCore
 
 #endif // WebKitGamepad_h