Avoid using WTF threading code in cc

cc/CCScopedTexture.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 CCScopedTexture_h
 #define CCScopedTexture_h
 
 #include "CCTexture.h"
 
 #if !ASSERT_DISABLED
-#include <wtf/MainThread.h>
+#include "base/threading/platform_thread.h"
 #endif
 
 namespace WebCore {
 
 class CCScopedTexture : protected CCTexture {
     WTF_MAKE_NONCOPYABLE(CCScopedTexture);
 public:
     static PassOwnPtr<CCScopedTexture> create(CCResourceProvider* resourceProvider) { return adoptPtr(new CCScopedTexture(resourceProvider)); }
     virtual ~CCScopedTexture();
 
     using CCTexture::id;
     using CCTexture::size;
     using CCTexture::format;
     using CCTexture::bytes;
 
     bool allocate(int pool, const IntSize&, GC3Denum format, CCResourceProvider::TextureUsageHint);
     void free();
     void leak();
 
 protected:
     explicit CCScopedTexture(CCResourceProvider*);
 
 private:
     CCResourceProvider* m_resourceProvider;
 
 #if !ASSERT_DISABLED
-    ThreadIdentifier m_allocateThreadIdentifier;
+    base::PlatformThreadId m_allocateThreadIdentifier;
 #endif
 };
 
 }
 
 #endif