Make header include guards great again

runtime/bin/directory.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 BIN_DIRECTORY_H_
-#define BIN_DIRECTORY_H_
+#ifndef RUNTIME_BIN_DIRECTORY_H_
+#define RUNTIME_BIN_DIRECTORY_H_
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
 #include "bin/reference_counting.h"
 #include "bin/thread.h"
 #include "platform/globals.h"
 
 namespace dart {
 namespace bin {
 
@@ skipping 276 matching lines @@
 
  private:
   static char* system_temp_path_override_;
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Directory);
 };
 
 }  // namespace bin
 }  // namespace dart
 
-#endif  // BIN_DIRECTORY_H_
+#endif  // RUNTIME_BIN_DIRECTORY_H_