Make header include guards great again

runtime/bin/fdutils.h

Index: runtime/bin/fdutils.h
diff --git a/runtime/bin/fdutils.h b/runtime/bin/fdutils.h
index 93bebfb1ec1ebc8ee4d0ec097ef9b7a2d09f412c..25cd4dda7cb3b0e54db3ef5aa2a518199f3b2242 100644
--- a/runtime/bin/fdutils.h
+++ b/runtime/bin/fdutils.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_FDUTILS_H_
-#define BIN_FDUTILS_H_
+#ifndef RUNTIME_BIN_FDUTILS_H_
+#define RUNTIME_BIN_FDUTILS_H_
 
 #include "bin/builtin.h"
 #include "platform/globals.h"
@@ -47,4 +47,4 @@ class FDUtils {
 }  // namespace bin
 }  // namespace dart
 
-#endif  // BIN_FDUTILS_H_
+#endif  // RUNTIME_BIN_FDUTILS_H_