Expand overloaded methods and optional parameters in the html library.

tools/dom/templates/html/impl/impl_Navigator.darttemplate

 // 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.
 
 part of $LIBRARYNAME;
 
 $(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 
 $if DART2JS
   @DomName('Navigator.language')
   String get language => JS('String', '#.language || #.userLanguage', this,
       this);
 $endif
 
   /**
    * Gets a stream (video and or audio) from the local computer.
    *
    * Use [MediaStream.supported] to check if this is supported by the current
    * platform. The arguments `audio` and `video` default to `false` (stream does
    * not use audio or video, respectively).
    *
    * Simple example usage:
    *
    *     window.navigator.getUserMedia(audio: true, video: true).then((stream) {
    *       var video = new VideoElement()
    *         ..autoplay = true
-   *         ..src = Url.createObjectUrl(stream);
+   *         ..src = Url.createObjectUrlFromStream(stream);
    *       document.body.append(video);
    *     });
    *
    * The user can also pass in Maps to the audio or video parameters to specify 
    * mandatory and optional constraints for the media stream. Not passing in a 
    * map, but passing in `true` will provide a MediaStream with audio or 
    * video capabilities, but without any additional constraints. The particular
    * constraint names for audio and video are still in flux, but as of this 
    * writing, here is an example providing more constraints.
    *
@@ skipping 48 matching lines @@
     }
   }
 
   @JSName('getUserMedia')
   void _getUserMedia(options, _NavigatorUserMediaSuccessCallback success,
       _NavigatorUserMediaErrorCallback error) native;
 $endif
 
 $!MEMBERS
 }