wikimedia/WikipediaMobile — pull request #178 by brion (2012-03-19 21:30:06+00:00)
Title: Bug 35164: high-resolution 'back'/'close' button

replaces icon with a double-resolution one suitable for Retina display. CSS use already specifies the size of the icon so it just needed to be dropped in at higher res. Original .xcf in scratch/