Bumping gaia.json for 1 gaia-1_2f revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2f/rev/7a7b3f2b40c7
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #14385 from gasolin/issue-935828

Bug 935828 - [hamachi][fugu]Volume warning in FM app do not disappear af..., r=alive
(cherry picked from commit 22f7ea4e7fa50d16834b838f3c356ca86810db24)