Remove WebKit::Platform dependencies from cc

cc/test/test_webkit_platform.h

-// Copyright (c) 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_TEST_TEST_WEBKIT_PLATFORM_H_
-#define CC_TEST_TEST_WEBKIT_PLATFORM_H_
-
-#include "base/rand_util.h"
-#include "base/threading/thread_local_storage.h"
-#include "cc/test/test_webkit_platform.h"
-#include "third_party/WebKit/Source/Platform/chromium/public/Platform.h"
-#include "webkit/compositor_bindings/web_compositor_support_impl.h"
-#include "webkit/glue/webthread_impl.h"
-
-using webkit_glue::WebThreadImplForMessageLoop;
-
-namespace cc {
-
-class TestWebKitPlatform : public WebKit::Platform {
- public:
-  TestWebKitPlatform();
-  virtual ~TestWebKitPlatform();
-
-  virtual WebKit::WebCompositorSupport* compositorSupport();
-
-  virtual void cryptographicallyRandomValues(
-      unsigned char* buffer, size_t length);
-
-  virtual WebKit::WebThread* createThread(const char* name);
-
-  virtual WebKit::WebThread* currentThread();
-
-  virtual double currentTime();
-
-  virtual double monotonicallyIncreasingTime();
-
- private:
-  base::ThreadLocalStorage::Slot current_thread_slot_;
-  webkit::WebCompositorSupportImpl compositor_support_;
-};
-
-}  // namespace cc
-
-#endif  // CC_TEST_TEST_WEBKIT_PLATFORM_H_