Make header include guards great again

runtime/vm/metrics.h

Index: runtime/vm/metrics.h
diff --git a/runtime/vm/metrics.h b/runtime/vm/metrics.h
index c34f02d323cccc1d1c4e55bc94634c8d92e0557d..66945852f17a2201033859c938f62a0dfae0b2e9 100644
--- a/runtime/vm/metrics.h
+++ b/runtime/vm/metrics.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_METRICS_H_
-#define VM_METRICS_H_
+#ifndef RUNTIME_VM_METRICS_H_
+#define RUNTIME_VM_METRICS_H_
 
 #include "vm/allocation.h"
 
@@ -179,4 +179,4 @@ class MetricHeapUsed : public Metric {
 
 }  // namespace dart
 
-#endif  // VM_METRICS_H_
+#endif  // RUNTIME_VM_METRICS_H_