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

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https://hg.mozilla.org/integration/gaia-central/rev/c84a6a7d5826
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Merge pull request #13076 from gregorwagner/9156772

Bug 915677 - canceling the awesome page does not allow focus back into the content. r=benfrancis

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https://hg.mozilla.org/integration/gaia-central/rev/f07c7affe006
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Bug 915677 - canceling the awesome page does not allow focus back into the content. r=benfrancis