Cleanup: remove not used forward declaration.

content/renderer/screen_orientation/screen_orientation_dispatcher.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 CONTENT_RENDERER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_DISPATCHER_H_
 #define CONTENT_RENDERER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_DISPATCHER_H_
 
 #include "base/compiler_specific.h"
 #include "base/id_map.h"
 #include "base/macros.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "third_party/WebKit/public/platform/WebLockOrientationCallback.h"
 #include "third_party/WebKit/public/platform/WebScreenOrientationClient.h"
 #include "third_party/WebKit/public/platform/WebScreenOrientationLockType.h"
 #include "third_party/WebKit/public/platform/WebScreenOrientationType.h"
 
-namespace blink {
-class WebScreenOrientationListener;
-}
-
 namespace content {
 
 class RenderFrame;
 
 // ScreenOrientationDispatcher implements the WebScreenOrientationClient API
 // which handles screen lock. It sends lock (or unlock) requests to the browser
 // process and listens for responses and let Blink know about the result of the
 // request via WebLockOrientationCallback.
 class CONTENT_EXPORT ScreenOrientationDispatcher :
     public RenderFrameObserver,
@@ skipping 29 matching lines @@
   // which is what IDMap was designed for.
   typedef IDMap<blink::WebLockOrientationCallback, IDMapOwnPointer> CallbackMap;
   CallbackMap pending_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenOrientationDispatcher);
 };
 
 }  // namespace content
 
 #endif // CONTENT_RENDERER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_DISPATCHER_H_