cc: Cleanup class/struct forward declarations

cc/trees/proxy.h

 // Copyright 2011 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 CC_TREES_PROXY_H_
 #define CC_TREES_PROXY_H_
 
 #include <memory>
 #include <string>
 
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/platform_thread.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "cc/base/cc_export.h"
 #include "cc/input/browser_controls_state.h"
 #include "cc/scheduler/begin_frame_source.h"
 #include "cc/trees/task_runner_provider.h"
 
 namespace gfx {
 class Rect;
-class Vector2d;
 }
 
 namespace cc {
-class BeginFrameSource;
-class LayerTreeDebugState;
 class LayerTreeMutator;
 class CompositorFrameSink;
 
 // Abstract interface responsible for proxying commands from the main-thread
 // side of the compositor over to the compositor implementation.
 class CC_EXPORT Proxy {
  public:
   virtual ~Proxy() {}
 
   virtual bool IsStarted() const = 0;
@@ skipping 38 matching lines @@
                                           BrowserControlsState current,
                                           bool animate) = 0;
 
   // Testing hooks
   virtual bool MainFrameWillHappenForTesting() = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROXY_H_