Make header include guards great again

runtime/vm/dart_api_message.h

 // 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_DART_API_MESSAGE_H_
-#define VM_DART_API_MESSAGE_H_
+#ifndef RUNTIME_VM_DART_API_MESSAGE_H_
+#define RUNTIME_VM_DART_API_MESSAGE_H_
 
 #include "include/dart_native_api.h"
 #include "platform/utils.h"
 #include "vm/allocation.h"
 #include "vm/dart_api_state.h"
 #include "vm/message.h"
 #include "vm/raw_object.h"
 #include "vm/snapshot.h"
 
 namespace dart {
@@ skipping 226 matching lines @@
   }
 
   static void ConvertNull(Dart_CObject* c_obj) {
     c_obj->type = Dart_CObject_kNull;
     c_obj->value.as_int64 = 0;
   }
 };
 
 }  // namespace dart
 
-#endif  // VM_DART_API_MESSAGE_H_
+#endif  // RUNTIME_VM_DART_API_MESSAGE_H_