Avoid using WTF threading code in cc

cc/CCScopedTexture.cpp

 // 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.
 
 #include "config.h"
 
 #include "CCScopedTexture.h"
 
 namespace WebCore {
 
@@ skipping 10 matching lines @@
 
 bool CCScopedTexture::allocate(int pool, const IntSize& size, GC3Denum format, CCResourceProvider::TextureUsageHint hint)
 {
     ASSERT(!id());
     ASSERT(!size.isEmpty());
 
     setDimensions(size, format);
     setId(m_resourceProvider->createResource(pool, size, format, hint));
 
 #if !ASSERT_DISABLED
-    m_allocateThreadIdentifier = WTF::currentThread();
+    m_allocateThreadIdentifier = base::PlatformThread::CurrentId();
 #endif
 
     return id();
 }
 
 void CCScopedTexture::free()
 {
     if (id()) {
-        ASSERT(m_allocateThreadIdentifier == WTF::currentThread());
+        ASSERT(m_allocateThreadIdentifier == base::PlatformThread::CurrentId());
         m_resourceProvider->deleteResource(id());
     }
     setId(0);
 }
 
 void CCScopedTexture::leak()
 {
     setId(0);
 }
 
 }