Move Mutex and Monitor from vm/ to platform/

runtime/platform/thread_macos.h

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, 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.
 
-#ifndef VM_THREAD_MACOS_H_
-#define VM_THREAD_MACOS_H_
+#ifndef PLATFORM_THREAD_MACOS_H_
+#define PLATFORM_THREAD_MACOS_H_
 
 #include <pthread.h>
 
-#include "vm/globals.h"
+#include "platform/globals.h"
 
 namespace dart {
 
 class ThreadData {
  private:
   ThreadData() {}
   ~ThreadData() {}
 
   pthread_t* tid() { return &tid_; }
 
@@ skipping 34 matching lines @@
   pthread_cond_t cond_;
 
   friend class Monitor;
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(MonitorData);
 };
 
 }  // namespace dart
 
-#endif  // VM_THREAD_MACOS_H_
+#endif  // PLATFORM_THREAD_MACOS_H_