Make header include guards great again

runtime/bin/dartutils.h

Index: runtime/bin/dartutils.h
diff --git a/runtime/bin/dartutils.h b/runtime/bin/dartutils.h
index ff2ae2041010d21f5e8ee0663b8fc0662026ef1a..c2ab3fb36f4a2cc6ef22657b3a66fc919effe5cf 100644
--- a/runtime/bin/dartutils.h
+++ b/runtime/bin/dartutils.h
@@ -2,8 +2,8 @@
 // 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 BIN_DARTUTILS_H_
-#define BIN_DARTUTILS_H_
+#ifndef RUNTIME_BIN_DARTUTILS_H_
+#define RUNTIME_BIN_DARTUTILS_H_
 
 #include "bin/isolate_data.h"
 #include "include/dart_api.h"
@@ -686,4 +686,4 @@ class ScopedMemBuffer {
 }  // namespace bin
 }  // namespace dart
 
-#endif  // BIN_DARTUTILS_H_
+#endif  // RUNTIME_BIN_DARTUTILS_H_