Screen Orientation API: cleanup, simplify and fix implementation.

public/platform/WebScreenOrientationListener.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 WebScreenOrientationListener_h
 #define WebScreenOrientationListener_h
 
-#include "WebScreenOrientation.h"
+#include "WebScreenOrientationType.h"
 
 namespace blink {
 
 class WebScreenOrientationListener {
 public:
     virtual ~WebScreenOrientationListener() { }
 
     // This method is called every time the screen orientation changes.
-    virtual void didChangeScreenOrientation(WebScreenOrientation) = 0;
+    virtual void didChangeScreenOrientation(WebScreenOrientationType) = 0;
 };
 
 } // namespace blink
 
 #endif // WebScreenOrientationListener_h