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

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https://hg.mozilla.org/integration/gaia-central/rev/99e9d27a6122
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #10691 from huchengtw-moz/video/Bug_876688_progress_slider_shows_0001

Bug 876688 - [video] Progress slider shows 00:01 when it first appears, r=@djf

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https://hg.mozilla.org/integration/gaia-central/rev/212aaa4fbe12
Author: John Hu <johu@mozilla.com>
Desc: Bug 876688 - [video] Progress slider shows 00:01 when it first appears