Back out changeset 29c172213ff7 (bug 853151) because of Ts and Tp5 regressions

--HG--
rename : browser/base/content/test/social/social_mark_image.png => browser/base/content/test/social/social_share_image.png
Back out changeset e7e44c2d6d72 (bug 860027) because of Ts and MaxHeap regressions