Scanner for UTF-8 byte arrays

tests/compiler/dart2js/unparser2_test.dart

 // 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.
 
 import "package:expect/expect.dart";
 import "../../../sdk/lib/_internal/compiler/implementation/scanner/scannerlib.dart";
 import "../../../sdk/lib/_internal/compiler/implementation/tree/tree.dart";
 
 import "../../../sdk/lib/_internal/compiler/implementation/dart2jslib.dart"
     show DiagnosticListener,
@@ skipping 42 matching lines @@
 
 void compareCode(String code) {
   Expect.equals(code, doUnparse(code));
 }
 
 String doUnparse(String source) {
   MessageCollector diagnosticListener = new MessageCollector();
   Script script = new Script(null, null);
   LibraryElement lib = new LibraryElementX(script);
   CompilationUnitElement element = new CompilationUnitElementX(script, lib);
-  StringScanner scanner = new StringScanner(source);
+  StringScanner scanner = new StringScanner.fromString(source);
   Token beginToken = scanner.tokenize();
   NodeListener listener = new NodeListener(diagnosticListener, element);
   Parser parser = new Parser(listener);
   parser.parseUnit(beginToken);
   Node node = listener.popNode();
   Expect.isTrue(listener.nodes.isEmpty);
   return unparse(node);
 }
 
 class MessageCollector implements DiagnosticListener {
@@ skipping 10 matching lines @@
   }
   void internalErrorOnElement(Element element, String message) {
     throw message;
   }
   void internalError(String message,
                      {Node node, Token token, dynamic instruction,
                       Element element}) {
     throw message;
   }
 }