content: Cleanup class/struct forward declarations

content/browser/renderer_host/input/synthetic_gesture_target_aura.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_SYNTHETIC_GESTURE_TARGET_AURA_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_TARGET_AURA_H_
 
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "content/browser/renderer_host/input/synthetic_gesture_target_base.h"
 #include "content/common/input/synthetic_gesture_params.h"
 
 namespace aura {
 class Window;
-class WindowEventDispatcher;
-
-namespace client {
-class ScreenPositionClient;
-}
 }  // namespace aura
 
 namespace content {
 
 // SyntheticGestureTarget implementation for aura
 class SyntheticGestureTargetAura : public SyntheticGestureTargetBase {
  public:
   explicit SyntheticGestureTargetAura(RenderWidgetHostImpl* host);
 
   // SyntheticGestureTargetBase:
@@ skipping 24 matching lines @@
   // device_scale_factor to convert the input event from DIP to device pixel
   // before dispatching it into platform.
   float device_scale_factor_;
 
   DISALLOW_COPY_AND_ASSIGN(SyntheticGestureTargetAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_TARGET_AURA_H_