Remove static mutexes/monitors from dart:io.

runtime/bin/process.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/dartutils.h"
 #include "bin/io_buffer.h"
 #include "bin/process.h"
 #include "bin/socket.h"
 
 #include "include/dart_api.h"
 
 
 namespace dart {
 namespace bin {
 
 static const int kProcessIdNativeField = 0;
 
 int Process::global_exit_code_ = 0;
-dart::Mutex Process::global_exit_code_mutex_;
+dart::Mutex* Process::global_exit_code_mutex_ = new dart::Mutex();
 
 // Extract an array of C strings from a list of Dart strings.
 static char** ExtractCStringList(Dart_Handle strings,
                                  Dart_Handle status_handle,
                                  const char* error_msg,
                                  intptr_t* length) {
   static const intptr_t kMaxArgumentListLength = 1024 * 1024;
   ASSERT(Dart_IsList(strings));
   intptr_t len = 0;
   Dart_Handle result = Dart_ListLength(strings, &len);
@@ skipping 230 matching lines @@
   uint8_t* buffer = NULL;
   Dart_Handle external_array = IOBuffer::Allocate(external_length, &buffer);
   memmove(buffer, system_string, external_length);
   if (utf8 != system_string) free(const_cast<char*>(system_string));
   Dart_SetReturnValue(args, external_array);
   Dart_ExitScope();
 }
 
 }  // namespace bin
 }  // namespace dart