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

========

https://hg.mozilla.org/integration/gaia-central/rev/30a28b592ed8
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #11353 from KevinGrandon/bug_901578_remove_mouse_shim_settings

Bug 901578 - Remove mouse_event_shim from settings r=kaze

========

https://hg.mozilla.org/integration/gaia-central/rev/86532663e60e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 901578 - Remove mouse_event_shim from settings