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

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https://hg.mozilla.org/integration/gaia-central/rev/3250702fbdc0
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

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https://hg.mozilla.org/integration/gaia-central/rev/6753784f25e5
Author: gasolin <gasolin@gmail.com>
Desc: Bug 935828 - [hamachi][fugu]Volume warning in FM app do not disappear after click home key