Kill some unused code.

src/log-utils.h

 // Copyright 2006-2009 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 250 matching lines @@
     return RetrieveCompressedPrevious(compressor, "");
   }
 
   // Does the same at the version without arguments, and sets a prefix.
   bool RetrieveCompressedPrevious(LogRecordCompressor* compressor,
                                   const char* prefix);
 
   // Write the log message to the log file currently opened.
   void WriteToLogFile();
 
-  // Write a null-terminated string to to the log file currently opened.
-  void WriteCStringToLogFile(const char* str);
-
   // A handler that is called when Log::Write fails.
   typedef void (*WriteFailureHandler)();
 
   static void set_write_failure_handler(WriteFailureHandler handler) {
     write_failure_handler = handler;
   }
 
  private:
   static WriteFailureHandler write_failure_handler;
 
   ScopedLock sl;
   int pos_;
 };
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal
 
 #endif  // V8_LOG_UTILS_H_