Updated mediawiki/extensions
Project: mediawiki/extensions/PdfHandler  3a4584d3e2cf533a8048a5eb99c07ad3af58ceaa

QA: port PDF test from /qa/browsertests repo

This test is intended to be run against either test2wiki or
some wiki with proper support for downloading pages as PDF

It does not work in beta labs or in a bare wiki

Change-Id: I16dcc9d2692055c2b972c2a96dfc3f9860115fa4