Make header include guards great again

runtime/vm/freelist.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 VM_FREELIST_H_
-#define VM_FREELIST_H_
+#ifndef RUNTIME_VM_FREELIST_H_
+#define RUNTIME_VM_FREELIST_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/bit_set.h"
 #include "vm/raw_object.h"
 #include "vm/os_thread.h"
 
 namespace dart {
 
 // FreeListElement describes a freelist element.  Smallest FreeListElement is
@@ skipping 110 matching lines @@
   FreeListElement* free_lists_[kNumLists + 1];
 
   // The largest available small size in bytes, or negative if there is none.
   intptr_t last_free_small_size_;
 
   DISALLOW_COPY_AND_ASSIGN(FreeList);
 };
 
 }  // namespace dart
 
-#endif  // VM_FREELIST_H_
+#endif  // RUNTIME_VM_FREELIST_H_