Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  87e6bfc7143f0c3c40d97c26c172c84fdf855f15

Updated chevron icons

Chevron icons for the new design of the chevron.
Beware that the active version of the chevron is white since it is assuming
it will have a blue background.

Change-Id: I3d8fa040bfecc219a735565d5ebee8e283691bee