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

========

https://hg.mozilla.org/integration/gaia-central/rev/9b125b4cea53
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #16807 from alivedise/bugzilla/977450/navigation-chrome-false

Bug 977450 - AppChrome should not be instantiated if no navigation speci...,r=etienne

========

https://hg.mozilla.org/integration/gaia-central/rev/158419a7c0b7
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 977450 - AppChrome should not be instantiated if no navigation specified in manifest.
Bumping manifests a=b2g-bump