cc: Fix header include guards of our header files.

cc/completion_event.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 CCCompletionEvent_h
-#define CCCompletionEvent_h
+#ifndef CC_COMPLETION_EVENT_H_
+#define CC_COMPLETION_EVENT_H_
 
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/logging.h"
 
 namespace cc {
 
 // Used for making blocking calls from one thread to another. Use only when
 // absolutely certain that doing-so will not lead to a deadlock.
 //
@@ skipping 40 matching lines @@
     base::WaitableEvent m_event;
 #ifndef NDEBUG
     // Used to assert that wait() and signal() are each called exactly once.
     bool m_waited;
     bool m_signaled;
 #endif
 };
 
 }
 
-#endif
+#endif  // CC_COMPLETION_EVENT_H_