Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/4f179da417b8
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #24601 from timdream/lockscreen-unlock-unexpired

Bug 1075304 - Make sure we reach slideHide state when the user unlocks with unexpired passcode, r=snowmantw

========

https://hg.mozilla.org/integration/gaia-central/rev/dfe52b4b368d
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1075304 - Follow up, fix unit tests

========

https://hg.mozilla.org/integration/gaia-central/rev/6efc8cc86bc9
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1075304 - Make sure we reach slideHide state when the user unlocks with unexpired passcode
Bumping manifests a=b2g-bump