content: Cleanup class/struct forward declarations

content/browser/renderer_host/overscroll_controller.h

 // Copyright (c) 2012 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_OVERSCROLL_CONTROLLER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
-namespace ui {
-class LatencyInfo;
-}
-
 namespace content {
 
 class RenderWidgetHostViewAuraOverscrollTest;
 class OverscrollControllerDelegate;
 
 // Indicates the direction that the scroll is heading in relative to the screen,
 // with the top being NORTH.
 enum OverscrollMode {
   OVERSCROLL_NONE,
   OVERSCROLL_NORTH,
@@ skipping 96 matching lines @@
   // The delegate that receives the overscroll updates. The delegate is not
   // owned by this controller.
   OverscrollControllerDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(OverscrollController);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_H_