A mysterious browse history button was showing on the mobile diff view prior to this revert:
It cannot be clicked, is unstyled and obscures the display off the diff (space is limited on mobile)
It displays in both stable and beta mobile
Please test on mobile before you deploy things!!
- Make revision slider work on mobile
- Re-enable hook on MobileFrontend (revert https://gerrit.wikimedia.org/r/#/c/361944/)