Unify most of our utf8 implementations. This takes the implementation

frog/leg/scanner/node_scanner_bench.dart

Index: frog/leg/scanner/node_scanner_bench.dart
===================================================================
--- frog/leg/scanner/node_scanner_bench.dart	(revision 5167)
+++ frog/leg/scanner/node_scanner_bench.dart	(working copy)
@@ -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.
 
@@ -7,7 +7,7 @@
 #import('scannerlib.dart');
 #import('scanner_implementation.dart');
 #import('scanner_bench.dart');
-#import('../../../lib/utf8/utf8.dart');
+#import('../../../lib/utf/utf.dart');
 #source('byte_strings.dart');
 #source('byte_array_scanner.dart');