Updated mediawiki/extensions
Project: mediawiki/extensions/UploadWizard  89a64080d8a5770519a2ab3259d071a1f74f6f2d

Change existing inheritClass calls to mixinClass

Per reviews on transport refactors:

https://gerrit.wikimedia.org/r/#/c/178210/2/resources/mw.FirefoggTransport.js

Change-Id: If53c04e671d6330eba3855b263ea1abe97ffb868