Make header include guards great again

runtime/vm/unibrow.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_UNIBROW_H_
-#define VM_UNIBROW_H_
+#ifndef RUNTIME_VM_UNIBROW_H_
+#define RUNTIME_VM_UNIBROW_H_
 
 #include <sys/types.h>
 
 #include "vm/globals.h"
 
 /**
  * \file
  * Definitions and convenience functions for working with unicode.
  */
 
@@ skipping 45 matching lines @@
 struct CanonicalizationRange {
   static const intptr_t kMaxWidth = 1;
   static intptr_t Convert(int32_t c,
                           int32_t n,
                           int32_t* result,
                           bool* allow_caching_ptr);
 };
 
 }  // namespace unibrow
 
-#endif  // VM_UNIBROW_H_
+#endif  // RUNTIME_VM_UNIBROW_H_