Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/8f6f360a92e8
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #13939 from flodolo/bug941901

Bug 941901 - [settings] Use correct entity name for Cell broadcast r=crh0716(cherry picked from commit e42fdf6a6b77038b0a2cd46b9193378d84794c20)

Conflicts:
	apps/settings/elements/messaging.html