Screen Orientation API: cleanup, simplify and fix implementation.

Source/modules/screen_orientation/ScreenOrientationDispatcher.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 ScreenOrientationDispatcher_h
 #define ScreenOrientationDispatcher_h
 
 #include "public/platform/WebScreenOrientationListener.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class ScreenOrientationController;
 
 class ScreenOrientationDispatcher FINAL : public blink::WebScreenOrientationListener {
 public:
     static ScreenOrientationDispatcher& instance();
 
     void addController(ScreenOrientationController*);
     void removeController(ScreenOrientationController*);
 
 private:
     ScreenOrientationDispatcher();
 
     void purgeControllers();
     void startListening();
     void stopListening();
 
     // WebScreenOrientationListener API.
-    virtual void didChangeScreenOrientation(blink::WebScreenOrientation) OVERRIDE;
+    virtual void didChangeScreenOrientation(blink::WebScreenOrientationType) OVERRIDE;
 
     Vector<ScreenOrientationController*> m_controllers;
     bool m_needsPurge;
     bool m_isDispatching;
 };
 
 } // namespace WebCore
 
 #endif // ScreenOrientationDispatcher_h