Updated mediawiki/extensions
Project: mediawiki/extensions/UploadWizard  759aa360fd762e883c1ed593cb8e628900960e9d

Use confirmCloseWindow from mediawiki-core

Depends on I5d35b6fddd73cf56371eeda299ee0779cb40397a
See the card at http://fab.wmflabs.org/T517 

Change-Id: I9411a6d338eb40de622ccab2b07b89c6f60dbebc