content: Cleanup class/struct forward declarations

content/browser/renderer_host/input/input_router_impl.h

 // Copyright 2013 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_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 17 matching lines @@
 
 namespace ui {
 class LatencyInfo;
 struct DidOverscrollParams;
 }
 
 namespace content {
 
 class InputAckHandler;
 class InputRouterClient;
-class OverscrollController;
 struct InputEventAck;
 
 // A default implementation for browser input event routing.
 class CONTENT_EXPORT InputRouterImpl
     : public NON_EXPORTED_BASE(InputRouter),
       public NON_EXPORTED_BASE(GestureEventQueueClient),
       public NON_EXPORTED_BASE(MouseWheelEventQueueClient),
       public NON_EXPORTED_BASE(TouchEventQueueClient),
       public NON_EXPORTED_BASE(TouchpadTapSuppressionControllerClient) {
  public:
@@ skipping 206 matching lines @@
   InputEventStreamValidator output_stream_validator_;
 
   float device_scale_factor_;
 
   DISALLOW_COPY_AND_ASSIGN(InputRouterImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_IMPL_H_