content: Cleanup class/struct forward declarations

content/browser/renderer_host/input/gesture_event_queue.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_BROWSER_RENDERER_HOST_INPUT_GESTURE_EVENT_QUEUE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_EVENT_QUEUE_H_
 
 #include <stddef.h>
 
 #include <deque>
 #include <memory>
 
 #include "base/macros.h"
 #include "base/timer/timer.h"
 #include "content/browser/renderer_host/event_with_latency_info.h"
 #include "content/browser/renderer_host/input/tap_suppression_controller.h"
 #include "content/browser/renderer_host/input/touchpad_tap_suppression_controller.h"
 #include "content/browser/renderer_host/input/touchscreen_tap_suppression_controller.h"
 #include "content/common/content_export.h"
 #include "content/common/input/input_event_ack_state.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/gfx/transform.h"
 
 namespace content {
 class GestureEventQueueTest;
-class InputRouter;
 class MockRenderWidgetHost;
 
 // Interface with which the GestureEventQueue can forward gesture events, and
 // dispatch gesture event responses.
 class CONTENT_EXPORT GestureEventQueueClient {
  public:
   virtual ~GestureEventQueueClient() {}
 
   virtual void SendGestureEventImmediately(
       const GestureEventWithLatencyInfo& event) = 0;
@@ skipping 167 matching lines @@
   // Time window in which to debounce scroll/fling ends. Note that an interval
   // of zero effectively disables debouncing.
   base::TimeDelta debounce_interval_;
 
   DISALLOW_COPY_AND_ASSIGN(GestureEventQueue);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_EVENT_QUEUE_H_