remove unused WTF::dataLogFString function

third_party/WebKit/Source/wtf/DataLog.h

 /*
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 21 matching lines @@
 
 #include <stdarg.h>
 #include <stdio.h>
 
 namespace WTF {
 
 FilePrintStream& dataFile();
 
 WTF_EXPORT void dataLogFV(const char* format, va_list) WTF_ATTRIBUTE_PRINTF(1, 0);
 WTF_EXPORT void dataLogF(const char* format, ...) WTF_ATTRIBUTE_PRINTF(1, 2);
-WTF_EXPORT void dataLogFString(const char*);
 
 template<typename... T>
 void dataLog(const T&... values)
 {
     dataFile().print(values...);
 }
 
 } // namespace WTF
 
 using WTF::dataLog;
 using WTF::dataLogF;
-using WTF::dataLogFString;
 
 #endif // DataLog_h