Avoid using WTF threading code in cc

cc/test/CCSchedulerTestCommon.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 CCSchedulerTestCommon_h
 #define CCSchedulerTestCommon_h
 
 #include "CCDelayBasedTimeSource.h"
 #include "CCFrameRateController.h"
 #include "CCThread.h"
+#include "base/threading/platform_thread.h"
 #include <gtest/gtest.h>
 #include <wtf/OwnPtr.h>
 
 namespace WebKitTests {
 
 class FakeCCTimeSourceClient : public WebCore::CCTimeSourceClient {
 public:
     FakeCCTimeSourceClient() { reset(); }
     void reset() { m_tickCalled = false; }
     bool tickCalled() const { return m_tickCalled; }
@@ skipping 36 matching lines @@
     virtual void postTask(PassOwnPtr<Task>) { ASSERT_NOT_REACHED(); }
     virtual void postDelayedTask(PassOwnPtr<Task> task, long long delay)
     {
         if (m_runPendingTaskOnOverwrite && hasPendingTask())
             runPendingTask();
 
         EXPECT_TRUE(!hasPendingTask());
         m_pendingTask = task;
         m_pendingTaskDelay = delay;
     }
-    virtual WTF::ThreadIdentifier threadID() const { return 0; }
+    virtual base::PlatformThreadId threadID() const { return 0; }
 
 protected:
     OwnPtr<Task> m_pendingTask;
     long long m_pendingTaskDelay;
     bool m_runPendingTaskOnOverwrite;
 };
 
 class FakeCCTimeSource : public WebCore::CCTimeSource {
 public:
     FakeCCTimeSource()
@@ skipping 46 matching lines @@
 class FakeCCFrameRateController : public WebCore::CCFrameRateController {
 public:
     FakeCCFrameRateController(PassRefPtr<WebCore::CCTimeSource> timer) : WebCore::CCFrameRateController(timer) { }
 
     int numFramesPending() const { return m_numFramesPending; }
 };
 
 }
 
 #endif // CCSchedulerTestCommon_h