Simplify implementation of Mutex.

src/log-utils.cc

 // Copyright 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 30 matching lines @@
 Log::Log(Logger* logger)
   : is_stopped_(false),
     output_handle_(NULL),
     mutex_(NULL),
     message_buffer_(NULL),
     logger_(logger) {
 }
 
 
 void Log::Initialize(const char* log_file_name) {
-  mutex_ = OS::CreateMutex();
+  mutex_ = new Mutex;
   message_buffer_ = NewArray<char>(kMessageBufferSize);
 
   // --log-all enables all the log flags.
   if (FLAG_log_all) {
     FLAG_log_runtime = true;
     FLAG_log_api = true;
     FLAG_log_code = true;
     FLAG_log_gc = true;
     FLAG_log_suspect = true;
     FLAG_log_handles = true;
@@ skipping 193 matching lines @@
   ASSERT(pos_ <= Log::kMessageBufferSize);
   const int written = log_->WriteToFile(log_->message_buffer_, pos_);
   if (written != pos_) {
     log_->stop();
     log_->logger_->LogFailure();
   }
 }
 
 
 } }  // namespace v8::internal