Remove parts of //cc we aren't using

cc/trees/layer_tree_host_client.h

-// Copyright 2012 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_LAYER_TREE_HOST_CLIENT_H_
-#define CC_TREES_LAYER_TREE_HOST_CLIENT_H_
-
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/time/time.h"
-
-namespace gfx {
-class Vector2d;
-class Vector2dF;
-}
-
-namespace cc {
-class ContextProvider;
-class InputHandlerClient;
-class OutputSurface;
-struct BeginFrameArgs;
-
-class LayerTreeHostClient {
- public:
-  virtual void WillBeginMainFrame() = 0;
-  // Marks finishing compositing-related tasks on the main thread. In threaded
-  // mode, this corresponds to DidCommit().
-  virtual void BeginMainFrame(const BeginFrameArgs& args) = 0;
-  virtual void BeginMainFrameNotExpectedSoon() = 0;
-  virtual void DidBeginMainFrame() = 0;
-  virtual void Layout() = 0;
-  virtual void ApplyViewportDeltas(
-      const gfx::Vector2dF& inner_delta,
-      const gfx::Vector2dF& outer_delta,
-      const gfx::Vector2dF& elastic_overscroll_delta,
-      float page_scale,
-      float top_controls_delta) = 0;
-  virtual void ApplyViewportDeltas(const gfx::Vector2d& scroll_delta,
-                                   float page_scale,
-                                   float top_controls_delta) = 0;
-  // Request an OutputSurface from the client. When the client has one it should
-  // call LayerTreeHost::SetOutputSurface.  This will result in either
-  // DidFailToInitializeOutputSurface or DidInitializeOutputSurface being
-  // called.
-  virtual void RequestNewOutputSurface() = 0;
-  virtual void DidInitializeOutputSurface() = 0;
-  virtual void DidFailToInitializeOutputSurface() = 0;
-  virtual void WillCommit() = 0;
-  virtual void DidCommit() = 0;
-  virtual void DidCommitAndDrawFrame() = 0;
-  virtual void DidCompleteSwapBuffers() = 0;
-
-  // Called when page scale animation has completed.
-  virtual void DidCompletePageScaleAnimation() = 0;
-
-  // TODO(simonhong): Makes this to pure virtual function when client
-  // implementation is ready.
-  virtual void SendBeginFramesToChildren(const BeginFrameArgs& args) {}
-
-  // Requests that the client insert a rate limiting token in the shared main
-  // thread context's command stream that will block if the context gets too far
-  // ahead of the compositor's command stream. Only needed if the tree contains
-  // a TextureLayer that calls SetRateLimitContext(true).
-  virtual void RateLimitSharedMainThreadContext() {}
-
- protected:
-  virtual ~LayerTreeHostClient() {}
-};
-
-}  // namespace cc
-
-#endif  // CC_TREES_LAYER_TREE_HOST_CLIENT_H_