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/461969bc99d6
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #13846 from julienw/939971-sms-are-cut

Bug 939971 - [SMS] SMS are cut if you switch App while writing your text...(cherry picked from commit d2b07c096385e37621700c1162cd0803ec9282f6)

Conflicts:
	apps/sms/test/unit/compose_test.js