Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  a0d9e46ef6fb2f736411654c292c72cffbc0cc8e

Fix Chrome bug where popstate could still reset scroll position

Change-Id: I3418b2e446a210a406daacc1321103df1f09caa1
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/486