Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  e782473c9b6b2ea2d298fb1690e96b0817f2e951

Hygiene: Remove button.cancel in overlay header

No longer used, we went back to using window.confirm().

Change-Id: I61f25e610a69c0cba5ab2ba5e967122402c5e492