Move Source/WTF/wtf to Source/wtf

Source/wtf/dtoa/bignum-dtoa.h

 // Copyright 2010 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 66 matching lines @@
     // 'BignumDtoa' expects the given buffer to be big enough to hold all digits
     // and a terminating null-character.
     void BignumDtoa(double v, BignumDtoaMode mode, int requested_digits,
                     Vector<char> buffer, int* length, int* point);
     
 }  // namespace double_conversion
 
 } // namespace WTF
 
 #endif  // DOUBLE_CONVERSION_BIGNUM_DTOA_H_