Updated mediawiki/extensions
Project: mediawiki/extensions/Parsoid  a3d55d5fee8f3496ff35afd5a26440b1f6a9066e

Added utility method to process content in pipeline.

* This eliminates repetitive code from a few places and might be
  useful for future patches as well.

Change-Id: I383ed253a2fa20c1b7429689d17cde176751e29a