Make header include guards great again

runtime/vm/base_isolate.h

Index: runtime/vm/base_isolate.h
diff --git a/runtime/vm/base_isolate.h b/runtime/vm/base_isolate.h
index b2cc7fc223fcf04f0bc4bdcff03d2e219cf27825..bd76b90e9c9e0fd47b5dba352e90bc03409e54fd 100644
--- a/runtime/vm/base_isolate.h
+++ b/runtime/vm/base_isolate.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_BASE_ISOLATE_H_
-#define VM_BASE_ISOLATE_H_
+#ifndef RUNTIME_VM_BASE_ISOLATE_H_
+#define RUNTIME_VM_BASE_ISOLATE_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
@@ -47,4 +47,4 @@ class BaseIsolate {
 
 }  // namespace dart
 
-#endif  // VM_BASE_ISOLATE_H_
+#endif  // RUNTIME_VM_BASE_ISOLATE_H_