Make header include guards great again

runtime/vm/gc_sweeper.h

Index: runtime/vm/gc_sweeper.h
diff --git a/runtime/vm/gc_sweeper.h b/runtime/vm/gc_sweeper.h
index b2b831749b57a660b47386deccfacf95956a630a..ba9aaef9cee481bdb905cb2c36e3d41796940c76 100644
--- a/runtime/vm/gc_sweeper.h
+++ b/runtime/vm/gc_sweeper.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 VM_GC_SWEEPER_H_
-#define VM_GC_SWEEPER_H_
+#ifndef RUNTIME_VM_GC_SWEEPER_H_
+#define RUNTIME_VM_GC_SWEEPER_H_
 
 #include "vm/globals.h"
 
@@ -43,4 +43,4 @@ class GCSweeper {
 
 }  // namespace dart
 
-#endif  // VM_GC_SWEEPER_H_
+#endif  // RUNTIME_VM_GC_SWEEPER_H_