Updated mediawiki/extensions
Project: mediawiki/extensions/Parsoid  6d6ea2023db9126d1c8b1ddca117daa024f5f922
null
Fixed all serializer users to pass in original wikitext.

* Cleaned up some oldtext/src-wikitext code in serializer.
* Removed chunkCB callbacks from all serializeDOM calls in
  ParserService.
* Fixed a couple JSHint warnings/errors.

Change-Id: Ia4d1f3002acba48178f300e90ca6be4666f40479