Remove the USE(OS_RANDOMNESS) guard.

Source/wtf/RandomNumber.h

 /*
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 10 matching lines @@
  * 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 WTF_RandomNumber_h
 #define WTF_RandomNumber_h
 
 namespace WTF {
 
-#if !USE(OS_RANDOMNESS)
-namespace Internal {
-void initializeRandomNumber(uint64_t);
-}
-#endif
-
 // Returns a pseudo-random number in the range [0, 1), attempts to be
 // cryptographically secure if possible on the target platform
 WTF_EXPORT_PRIVATE double randomNumber();
 
 }
 
 using WTF::randomNumber;
 
 #endif