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

utils/pub/hosted_source.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 hosted_source;
 
 import 'dart:io' as io;
 import 'dart:json';
 import 'dart:uri';
 
@@ skipping 108 matching lines @@
   bool descriptionsEqual(description1, description2) =>
       _parseDescription(description1) == _parseDescription(description2);
 
   /**
    * Ensures that [description] is a valid hosted package description.
    *
    * There are two valid formats. A plain string refers to a package with the
    * given name from the default host, while a map with keys "name" and "url"
    * refers to a package with the given name from the host at the given URL.
    */
-  void validateDescription(description, [bool fromLockFile=false]) {
+  void validateDescription(description, {bool fromLockFile: false}) {
     _parseDescription(description);
   }
 
   /**
    * Parses the description for a package.
    *
    * If the package parses correctly, this returns a (name, url) pair. If not,
    * this throws a descriptive FormatException.
    */
   Pair<String, String> _parseDescription(description) {
@@ skipping 13 matching lines @@
 
     var name = description["name"];
     if (name is! String) {
       throw new FormatException("The 'name' key must have a string value.");
     }
 
     var url = description.containsKey("url") ? description["url"] : defaultUrl;
     return new Pair<String, String>(name, url);
   }
 }