Update scanner so tests pass.

pkg/dart_scanner/lib/src/abstract_scanner.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.
 
-library scanner.abstract_scanner;
+library dart_scanner.abstract_scanner;
 
 import '../scanner.dart' show
     Scanner;
 
 import 'keyword.dart' show
     KeywordState,
     Keyword;
 
 import 'precedence.dart';
 
@@ skipping 1149 matching lines @@
 
 PrecedenceInfo closeBraceInfoFor(BeginGroupToken begin) {
   return const {
     '(': CLOSE_PAREN_INFO,
     '[': CLOSE_SQUARE_BRACKET_INFO,
     '{': CLOSE_CURLY_BRACKET_INFO,
     '<': GT_INFO,
     r'${': CLOSE_CURLY_BRACKET_INFO,
   }[begin.value];
 }