Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  155aef2981a7d07778071e94760b2a4497dae8de

Support real position fixed on Android 2.

Android browser from 2.1 supports position fixed with a locked
viewport [1]

[1] http://caniuse.com/css-fixed

Change-Id: I52e5d61a6d4e84dabadebd5ff290fdad776a9a62