Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/83e7499ae354
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #14347 from evanxd/bug-945611

Bug 945611 - Run marionette tests for a specific app.

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https://hg.mozilla.org/integration/gaia-central/rev/248194f26768
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 945611 - Run marionette tests for a specific app.

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https://hg.mozilla.org/integration/gaia-central/rev/ea2fa67f2104
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #13791 from gasolin/issue-914028

Bug 914028 - Display video (camera) device list in permission acquisitio...r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/1a34d0502708
Author: gasolin <gasolin@gmail.com>
Desc: Bug 914028 - Display video (camera) device list in permission acquisition prompt