Change core lib, dart2js, and more for new optional parameters syntax

utils/apidoc/html_diff.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.
 
 /**
  * A script to assist in documenting the difference between the dart:html API
  * and the old DOM API.
  */
 #library('html_diff');
 
@@ skipping 55 matching lines @@
   /**
    * Perform static initialization of [world]. This should be run before
    * calling [HtmlDiff.run].
    */
   static void initialize(Path libDir) {
     _compilation = new Compilation.library(<Path>[new Path(HTML_LIBRARY_NAME)],
                                            libDir);
     _mirrors = _compilation.mirrors;
   }
 
-  HtmlDiff([bool printWarnings = false]) :
+  HtmlDiff({bool printWarnings: false}) :
     _printWarnings = printWarnings,
     htmlToDom = new Map<String, Set<String>>(),
     htmlTypesToDom = new Map<String, Set<String>>(),
     comments = new CommentMap();
 
   void warn(String s) {
     if (_printWarnings) {
       print('Warning: $s');
     }
   }
@@ skipping 138 matching lines @@
   Map<String, String> _getTags(String comment) {
     if (comment == null) return const <String, String>{};
     final re = const RegExp("@([a-zA-Z]+) ([^;]+)(?:;|\$)");
     final tags = <String, String>{};
     for (var m in re.allMatches(comment.trim())) {
       tags[m[1]] = m[2];
     }
     return tags;
   }
 }