Make header include guards great again

runtime/vm/scanner.h

 // Copyright (c) 2011, 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.
 //
 // Scanner class for the Dart language. The scanner reads source text
 // and produces a stream of tokens which is used by the parser.
 //
 
-#ifndef VM_SCANNER_H_
-#define VM_SCANNER_H_
+#ifndef RUNTIME_VM_SCANNER_H_
+#define RUNTIME_VM_SCANNER_H_
 
 #include "vm/growable_array.h"
 #include "vm/token.h"
 
 namespace dart {
 
 // Forward declarations.
 class Array;
 class Library;
 class RawString;
@@ skipping 190 matching lines @@
   Thread* thread_;
   Zone* zone_;
 
   static KeywordTable keywords_[Token::kNumKeywords];
   static int keywords_char_offset_[kNumLowercaseChars];
 };
 
 
 }  // namespace dart
 
-#endif  // VM_SCANNER_H_
+#endif  // RUNTIME_VM_SCANNER_H_