Revert r156542 "Do not include "wtf/Platform.h" directly. "

Source/wtf/ThreadingPrimitives.h

 /*
  * Copyright (C) 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com)
  *
  * 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.
@@ skipping 13 matching lines @@
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
 
 #ifndef ThreadingPrimitives_h
 #define ThreadingPrimitives_h
 
+#include "wtf/Platform.h"
+
 #include "wtf/Assertions.h"
 #include "wtf/FastAllocBase.h"
 #include "wtf/Locker.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/WTFExport.h"
 
 #if OS(WINDOWS)
 #include <windows.h>
 #endif
 
@@ skipping 90 matching lines @@
 using WTF::Mutex;
 using WTF::MutexLocker;
 using WTF::MutexTryLocker;
 using WTF::ThreadCondition;
 
 #if OS(WINDOWS)
 using WTF::absoluteTimeToWaitTimeoutInterval;
 #endif
 
 #endif // ThreadingPrimitives_h