Move Source/WTF/wtf to Source/wtf

Source/wtf/MediaTime.cpp

 /*
  * Copyright (C) 2012 Apple 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 332 matching lines @@
         return MediaTime::invalidTime();
     if (rhs.isNegativeInfinite() || rhs.isPositiveInfinite())
         return MediaTime::positiveInfiniteTime();
     MediaTime val = rhs;
     val.m_timeValue *= signum(rhs.m_timeScale) * signum(rhs.m_timeValue);
     return val;
 }
 
 }