Fix CompositorResizeLock to do something.

content/browser/renderer_host/resize_lock.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_RESIZE_LOCK_H_
-#define CONTENT_BROWSER_RENDERER_HOST_RESIZE_LOCK_H_
-
-#include "base/macros.h"
-#include "content/common/content_export.h"
-#include "ui/gfx/geometry/size.h"
-
-namespace content {
-
-class CONTENT_EXPORT ResizeLock {
- public:
-  virtual ~ResizeLock();
-
-  virtual bool GrabDeferredLock();
-  virtual void UnlockCompositor();
-
-  const gfx::Size& expected_size() const { return new_size_; }
-
- protected:
-  ResizeLock(const gfx::Size new_size, bool defer_compositor_lock);
-
-  virtual void LockCompositor();
-
- private:
-  gfx::Size new_size_;
-  bool defer_compositor_lock_;
-
-  DISALLOW_COPY_AND_ASSIGN(ResizeLock);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_RENDERER_HOST_RESIZE_LOCK_H_