content: Cleanup class/struct forward declarations

content/browser/renderer_host/input/synthetic_gesture_target_android.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_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_TARGET_ANDROID_H_
 
 #include <stdint.h>
 
 #include "base/android/jni_android.h"
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "content/browser/renderer_host/input/synthetic_gesture_target_base.h"
 
 namespace content {
 
-class ContentViewCoreImpl;
-
 class SyntheticGestureTargetAndroid : public SyntheticGestureTargetBase {
  public:
   SyntheticGestureTargetAndroid(
       RenderWidgetHostImpl* host,
       base::android::ScopedJavaLocalRef<jobject> touch_event_synthesizer);
   ~SyntheticGestureTargetAndroid() override;
 
   // SyntheticGestureTargetBase:
   void DispatchWebTouchEventToPlatform(
       const blink::WebTouchEvent& web_touch,
@@ skipping 32 matching lines @@
                    int64_t time_in_ms);
 
   base::android::ScopedJavaGlobalRef<jobject> touch_event_synthesizer_;
 
   DISALLOW_COPY_AND_ASSIGN(SyntheticGestureTargetAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_TARGET_ANDROID_H_