content: Cleanup class/struct forward declarations

content/renderer/android/synchronous_compositor_proxy.h

 // Copyright 2015 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_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_PROXY_H_
 #define CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_PROXY_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "base/optional.h"
 #include "content/common/input/input_event_ack_state.h"
 #include "content/renderer/android/synchronous_compositor_frame_sink.h"
 #include "ui/events/blink/synchronous_input_handler_proxy.h"
 #include "ui/gfx/geometry/scroll_offset.h"
 #include "ui/gfx/geometry/size_f.h"
 
-class SkCanvas;
-
 namespace IPC {
 class Message;
 class Sender;
 }  // namespace IPC
 
-namespace blink {
-class WebInputEvent;
-}  // namespace blink
-
 namespace cc {
 class CompositorFrame;
 }  // namespace cc
 
 namespace content {
 
 class SynchronousCompositorFrameSink;
 struct SyncCompositorCommonRendererParams;
 struct SyncCompositorDemandDrawHwParams;
 struct SyncCompositorDemandDrawSwParams;
@@ skipping 92 matching lines @@
   bool need_animate_scroll_;
   uint32_t need_invalidate_count_;
   uint32_t did_activate_pending_tree_count_;
 
   DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorProxy);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_PROXY_H_