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

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https://hg.mozilla.org/integration/gaia-central/rev/f8821421aa40
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #13865 from gasolin/issue-940531

Bug 940531 - The persistent notification should display the origin, rath..., r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/f534e62fbf80
Author: gasolin <gasolin@gmail.com>
Desc: Bug 940531 - The persistent notification should display the origin, rather than the full URL for active getUserMedia requests