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

runtime/bin/directory.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.
 
 /**
  * [Directory] objects are used for working with directories.
  */
 abstract class Directory {
   /**
    * Creates a directory object. The path is either an absolute path,
@@ skipping 108 matching lines @@
    */
   Directory renameSync(String newPath);
 
   /**
    * List the sub-directories and files of this
    * [Directory]. Optionally recurse into sub-directories. Returns a
    * [DirectoryLister] object representing the active listing
    * operation. Handlers for files and directories should be
    * registered on this DirectoryLister object.
    */
-  DirectoryLister list([bool recursive = false]);
+  DirectoryLister list({bool recursive: false});
 
   /**
    * Gets the path of this directory.
    */
   final String path;
 }
 
 
 /**
  * A [DirectoryLister] represents an actively running listing operation.
@@ skipping 52 matching lines @@
       if (path != null) {
         sb.add(", path = $path");
       }
     }
     return sb.toString();
   }
   final String message;
   final String path;
   final OSError osError;
 }