Bumping gaia.json for 4 gaia-central revision(s) a=NPOTB

========

https://hg.mozilla.org/integration/gaia-central/rev/7ef93a274847
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #12086 from alivedise/bugzilla/905116_master_v4_test/homescreen-launcher

Bug 905116 - Implement Homescreen Window + Homescreen Launcher, r=timdream

========

https://hg.mozilla.org/integration/gaia-central/rev/16bdf301e1b3
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 905116 - Implement Homescreen Window + Homescreen Launcher

========

https://hg.mozilla.org/integration/gaia-central/rev/f8390293343f
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #12240 from huchengtw-moz/video/Bug_916651_move_setMessageHandle_to_init

Bug 916651 - move setMessageHandler to init, r=djf

========

https://hg.mozilla.org/integration/gaia-central/rev/dbbd4c2b0a0e
Author: John Hu <johu@mozilla.com>
Desc: Bug 916651 - move setMessageHandler to init