Updated mediawiki/extensions
Project: mediawiki/extensions/Parsoid  aff9ac09348c3b788c0423ee090e643cd7f73c11

Code cleanup + additional debugging stmts in DOMDiff.js

* Ported over cleanup and debugging code from the abandoned patch
  https://gerrit.wikimedia.org/r/#/c/59448/

* No change in any test results.

Change-Id: I1a6efc6beb036ea2f8fd2e04b79677433404efc6