Fix relative URIs in HLS manifest

For some reason, in some of my testing, the captured "uri" variable
was undefined by the time the Promise was resolved.  Instead, use
"response.uri", which accounts for redirects anyway.

Issue #279

Change-Id: Ibaef99a57dc01a665d095fec4765ac9b32d537ac

lib/hls/hls_parser.js

@@ -501,7 +501,8 @@ shaka.hls.HlsParser.prototype.createStreamInfo_ =
 
   return this.requestManifest_(uri).then(function(response) {
     var playlistData = response.data;
-    var playlist = this.manifestTextParser_.parsePlaylist(playlistData, uri);
+    var playlist = this.manifestTextParser_.parsePlaylist(playlistData,
+                                                          response.uri);
     if (playlist.type != shaka.hls.PlaylistType.MEDIA) {
       // EXT-X-MEDIA tags should point to media playlists.
       throw new shaka.util.Error(