Remove the USE(OS_RANDOMNESS) guard.

Source/core/platform/UUID.cpp

 /*
 * Copyright (C) 2010 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 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.
  */
 
 #include "config.h"
 #include "UUID.h"
 
-#include "NotImplemented.h"
 #include <wtf/CryptographicallyRandomNumber.h>
 #include <wtf/HexNumber.h>
 #include <wtf/text/StringBuilder.h>
 
 namespace WebCore {
 
 String createCanonicalUUIDString()
 {
-#if USE(OS_RANDOMNESS)
     unsigned randomData[4];
     cryptographicallyRandomValues(reinterpret_cast<unsigned char*>(randomData), sizeof(randomData));
 
     // Format as Version 4 UUID.
     StringBuilder builder;
     builder.reserveCapacity(36);
     appendUnsignedAsHexFixedSize(randomData[0], builder, 8, Lowercase);
     builder.append("-");
     appendUnsignedAsHexFixedSize(randomData[1] >> 16, builder, 4, Lowercase);
     builder.append("-4");
     appendUnsignedAsHexFixedSize(randomData[1] & 0x00000fff, builder, 3, Lowercase);
     builder.append("-");
     appendUnsignedAsHexFixedSize((randomData[2] >> 30) | 0x8, builder, 1, Lowercase);
     appendUnsignedAsHexFixedSize((randomData[2] >> 16) & 0x00000fff, builder, 3, Lowercase);
     builder.append("-");
     appendUnsignedAsHexFixedSize(randomData[2] & 0x0000ffff, builder, 4, Lowercase);
     appendUnsignedAsHexFixedSize(randomData[3], builder, 8, Lowercase);
     return builder.toString();
-#else
-    notImplemented();
-    return String();
-#endif
 }
 
 }