Make header include guards great again

runtime/vm/os_thread_fuchsia.h

 // Copyright (c) 2016, 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_OS_THREAD_FUCHSIA_H_
-#define VM_OS_THREAD_FUCHSIA_H_
+#ifndef RUNTIME_VM_OS_THREAD_FUCHSIA_H_
+#define RUNTIME_VM_OS_THREAD_FUCHSIA_H_
 
-#if !defined(VM_OS_THREAD_H_)
+#if !defined(RUNTIME_VM_OS_THREAD_H_)
 #error Do not include os_thread_fuchsia.h directly; use os_thread.h instead.
 #endif
 
 #include <pthread.h>
 
 #include "platform/assert.h"
 #include "platform/globals.h"
 
 namespace dart {
 
@@ skipping 51 matching lines @@
   pthread_cond_t cond_;
 
   friend class Monitor;
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(MonitorData);
 };
 
 }  // namespace dart
 
-#endif  // VM_OS_THREAD_FUCHSIA_H_
+#endif  // RUNTIME_VM_OS_THREAD_FUCHSIA_H_