Regenerate libraries.

sdk/lib/html/dart2js/html_dart2js.dart

 library html;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:html_common';
 import 'dart:indexed_db';
 import 'dart:isolate';
 import 'dart:json' as json;
 import 'dart:math';
 import 'dart:svg' as svg;
@@ skipping 13901 matching lines @@
 
 
 
 @DocsEditable
 @DomName('MediaStream')
 class MediaStream extends EventTarget native "*MediaStream" {
 
   static const EventStreamProvider<Event> endedEvent = const EventStreamProvider<Event>('ended');
 
   @DocsEditable
-  factory MediaStream(MediaStreamTrackList audioTracks, MediaStreamTrackList videoTracks) => MediaStream._create(audioTracks, videoTracks);
-  static MediaStream _create(MediaStreamTrackList audioTracks, MediaStreamTrackList videoTracks) => JS('MediaStream', 'new MediaStream(#,#)', audioTracks, videoTracks);
+  factory MediaStream() => MediaStream._create();
+  static MediaStream _create() => JS('MediaStream', 'new MediaStream()');
 
   @DocsEditable
   @DomName('EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent')
   MediaStreamEvents get on =>
     new MediaStreamEvents(this);
 
   static const int ENDED = 2;
 
   static const int LIVE = 1;
 
@@ skipping 14843 matching lines @@
       _position = nextPosition;
       return true;
     }
     _current = null;
     _position = _array.length;
     return false;
   }
 
   T get current => _current;
 }