Split dart:builtin into dart:builtin and dart:io.

frog/leg/scanner/scanner_bench.dart

Index: frog/leg/scanner/scanner_bench.dart
diff --git a/frog/leg/scanner/scanner_bench.dart b/frog/leg/scanner/scanner_bench.dart
index 0627faac2c8316aee9bb369f5f44bb2d47e4e79b..fbfc3244532ad1a231ab068bc0fad5767862ca15 100644
--- a/frog/leg/scanner/scanner_bench.dart
+++ b/frog/leg/scanner/scanner_bench.dart
@@ -1,4 +1,4 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
@@ -124,4 +124,4 @@ class ProgressBar {
     geoMean = Math.pow(geoMean, 1/Math.max(count, 1));
     return geoMean.round().toInt();
   }
-}
+}