Cleanup Mutex and related classes.

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 89 matching lines @@
     void AppendDetailed(String* str, bool show_impl_info);
 
     // Append a portion of a string.
     void AppendStringPart(const char* str, int len);
 
     // Write the log message to the log file currently opened.
     void WriteToLogFile();
 
    private:
     Log* log_;
-    ScopedLock sl;
+    LockGuard<Mutex> lock_guard_;
     int pos_;
   };
 
  private:
   explicit Log(Logger* logger);
 
   // Opens stdout for logging.
   void OpenStdout();
 
   // Opens file for logging.
@@ skipping 14 matching lines @@
 
   // Whether logging is stopped (e.g. due to insufficient resources).
   bool is_stopped_;
 
   // When logging is active output_handle_ is used to store a pointer to log
   // destination.  mutex_ should be acquired before using output_handle_.
   FILE* output_handle_;
 
   // mutex_ is a Mutex used for enforcing exclusive
   // access to the formatting buffer and the log file or log memory buffer.
-  Mutex* mutex_;
+  Mutex mutex_;
 
   // Buffer used for formatting log messages. This is a singleton buffer and
   // mutex_ should be acquired before using it.
   char* message_buffer_;
 
   Logger* logger_;
 
   friend class Logger;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LOG_UTILS_H_