Last modified: 2013-12-18 22:39:28 UTC
UploadWizard has its own logging library (mw.Log.js) that creates an object/function (mw.log) with the exact same name as core (resources/mediawiki/mediawiki.log.js). The quick fix is to rename UploadWizard's. Better is to get rid of UploadWizard's and use core's.
https://gerrit.wikimedia.org/r/#/c/79917/
Change 79917 had a related patch set uploaded by MarkTraceur: No need to use custom mw.log anymore https://gerrit.wikimedia.org/r/79917
Change 79917 merged by jenkins-bot: No need to use custom mw.log anymore https://gerrit.wikimedia.org/r/79917
Woohoo.