Move WebScreenOrientationClient to WebFrameClient.

public/platform/WebScreenOrientationClient.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 WebScreenOrientationClient_h
 #define WebScreenOrientationClient_h
 
 #include "public/platform/WebScreenOrientationLockType.h"
 
 namespace blink {
 
 class WebLockOrientationCallback;
 
-// Client handling screen orientation locking for a given WebView.
+// Client handling screen orientation locking for a given WebFrame.
 class WebScreenOrientationClient {
 public:
     virtual ~WebScreenOrientationClient() { }
 
     // Request a screen orientation lock. The implementation will own the callback.
     virtual void lockOrientation(WebScreenOrientationLockType, WebLockOrientationCallback*) = 0;
 
     // Unlock the screen orientation. No-op if the screen orientation was not locked.
     virtual void unlockOrientation() = 0;
 };
 
 } // namespace blink
 
 #endif // WebScreenOrientationClient_h