Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  ceb9fa6fcecc518cd67ba736e627d2781fb433ab
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Move all polyfills to polyfills.js (code health)

Also, get rid of mobile.head module (saves us one request).

Change-Id: I39bf19b459a5ab48cce2b52c79aaea4802d59c42