Remove static thread pointers from CC

webkit/compositor_bindings/web_compositor_impl.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 WebCompositorImpl_h
-#define WebCompositorImpl_h
-
-#include "third_party/WebKit/Source/Platform/chromium/public/WebCompositor.h"
-
-namespace cc {
-class Thread;
-}
-
-namespace WebKit {
-
-class WebThread;
-
-class WebCompositorImpl : public WebCompositor {
-public:
-    static bool initialized();
-
-    static void initialize(WebThread* implThread);
-    static bool isThreadingEnabled();
-    static void shutdown();
-
-private:
-    static bool s_initialized;
-    static cc::Thread* s_mainThread;
-    static cc::Thread* s_implThread;
-};
-
-}
-
-#endif // WebCompositorImpl_h