Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/da574ead7634
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #13380 from zacc/bug_934940

Bug 934940 - Python  Repair SMS app tests failing after HTML changes

========

https://hg.mozilla.org/integration/gaia-central/rev/16d8e31b9337
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 934940 - Python update test flow to accomodate html changes