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

pkg/dartdoc/lib/src/markdown/inline_parser.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.
 
 /// Maintains the internal state needed to parse inline span elements in
 /// markdown.
 class InlineParser {
   static List<InlineSyntax> get syntaxes {
     // Lazy initialize.
     if (_syntaxes == null) {
@@ skipping 156 matching lines @@
     }
     return false;
   }
 
   abstract bool onMatch(InlineParser parser, Match match);
 }
 
 /// Matches stuff that should just be passed through as straight text.
 class TextSyntax extends InlineSyntax {
   String substitute;
-  TextSyntax(String pattern, [String sub])
+  TextSyntax(String pattern, {String sub})
     : super(pattern),
       substitute = sub;
 
   bool onMatch(InlineParser parser, Match match) {
     if (substitute == null) {
       // Just use the original matched text.
       parser.advanceBy(match[0].length);
       return false;
     }
 
@@ skipping 19 matching lines @@
     return true;
   }
 }
 
 /// Matches syntax that has a pair of tags and becomes an element, like `*` for
 /// `<em>`. Allows nested tags.
 class TagSyntax extends InlineSyntax {
   final RegExp endPattern;
   final String tag;
 
-  TagSyntax(String pattern, [String tag, String end = null])
+  TagSyntax(String pattern, {String tag, String end})
     : super(pattern),
       endPattern = new RegExp((end != null) ? end : pattern, multiLine: true),
       tag = tag;
     // TODO(rnystrom): Doing this.field doesn't seem to work with named args.
 
   bool onMatch(InlineParser parser, Match match) {
     parser._stack.add(new TagState(parser.pos,
       parser.pos + match[0].length, this));
     return true;
   }
@@ skipping 171 matching lines @@
       parser.consume(endMatch[0].length);
     } else {
       // Didn't close correctly so revert to text.
       parser.start = startPos;
       parser.advanceBy(endMatch[0].length);
     }
 
     return null;
   }
 }