Make header include guards great again

runtime/vm/object_graph.h

 // Copyright (c) 2014, 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_OBJECT_GRAPH_H_
-#define VM_OBJECT_GRAPH_H_
+#ifndef RUNTIME_VM_OBJECT_GRAPH_H_
+#define RUNTIME_VM_OBJECT_GRAPH_H_
 
 #include "vm/allocation.h"
 #include "vm/object.h"
 
 namespace dart {
 
 class Isolate;
 
 // Utility to traverse the object graph in an ordered fashion.
 // Example uses:
@@ skipping 81 matching lines @@
   // objects.
   // TODO(koda): Document format; support streaming/chunking.
   intptr_t Serialize(WriteStream* stream, bool collect_garbage);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ObjectGraph);
 };
 
 }  // namespace dart
 
-#endif  // VM_OBJECT_GRAPH_H_
+#endif  // RUNTIME_VM_OBJECT_GRAPH_H_