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

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https://hg.mozilla.org/integration/gaia-central/rev/997156ae4add
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #15340 from huchengtw-moz/video/Bug_947103-visual-update-player

Bug 947103 - [Video] Update to refreshed video player, r=ivanovpavel

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https://hg.mozilla.org/integration/gaia-central/rev/27babd36ee0c
Author: John Hu <johu@mozilla.com>
Desc: Bug 947103 - [Video] Update to refreshed video player
Bumping manifests a=b2g-bump