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

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https://hg.mozilla.org/integration/gaia-central/rev/596dd2c001aa
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #12198 from huchengtw-moz/video/Bug_916032_unable_to_pick_file

Bug 916032 - pick activity of video unable to choose file, r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/7bd29d92ecab
Author: John Hu <johu@mozilla.com>
Desc: Bug 916032 - pick activity of video unable to choose file