Remove duplicated headers from platform/

Source/platform/Timer.cpp

 /*
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 13 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "platform/Timer.h"
 
 #include "platform/PlatformThreadData.h"
 #include "platform/ThreadTimers.h"
 #include "wtf/CurrentTime.h"
 #include "wtf/HashSet.h"
-#include "wtf/Vector.h"
 #include <limits.h>
 #include <math.h>
 #include <limits>
 
 using namespace std;
 
 namespace WebCore {
 
 class TimerHeapReference;
 
@@ skipping 362 matching lines @@
 }
 
 double TimerBase::nextUnalignedFireInterval() const
 {
     ASSERT(isActive());
     return max(m_unalignedNextFireTime - monotonicallyIncreasingTime(), 0.0);
 }
 
 } // namespace WebCore