Avoid using WTF threading code in cc

cc/CCProxy.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 CCProxy_h
 #define CCProxy_h
 
 #include "IntRect.h"
 #include <public/WebCompositorOutputSurface.h>
 #include <wtf/Noncopyable.h>
 #include <wtf/PassOwnPtr.h>
 #include <wtf/PassRefPtr.h>
-#include <wtf/Threading.h>
 
 namespace WebCore {
 
 class CCThread;
 struct CCRenderingStats;
 struct RendererCapabilities;
 
 // Abstract class responsible for proxying commands from the main-thread side of
 // the compositor over to the compositor implementation.
 class CCProxy {
@@ skipping 94 matching lines @@
 #if !ASSERT_DISABLED
         ASSERT(CCProxy::isMainThreadBlocked());
         CCProxy::setMainThreadBlocked(false);
 #endif
     }
 };
 
 }
 
 #endif