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

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https://hg.mozilla.org/integration/gaia-central/rev/a936fc5f8ef3
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #10523 from mozshiao9/master_video_885229

Bug 885229 - [Video] headphoneschange event for videos playing from gall..., r=dkuo

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https://hg.mozilla.org/integration/gaia-central/rev/b777c6139ca5
Author: Mark Shiao <mshiao@mozilla.com>
Desc: Bug 885229 - [Video] headphoneschange event for videos playing from gallery and camera filmstrip