Make header include guards great again

runtime/vm/unicode.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_UNICODE_H_
-#define VM_UNICODE_H_
+#ifndef RUNTIME_VM_UNICODE_H_
+#define RUNTIME_VM_UNICODE_H_
 
 #include "vm/allocation.h"
 #include "vm/globals.h"
 
 namespace dart {
 
 class String;
 
 class Utf : AllStatic {
  public:
@@ skipping 204 matching lines @@
 
   // Data for small code points with one mapping
   static const int16_t stage2_[];
 
   // Data for large code points or code points with both mappings.
   static const int32_t stage2_exception_[][2];
 };
 
 }  // namespace dart
 
-#endif  // VM_UNICODE_H_
+#endif  // RUNTIME_VM_UNICODE_H_