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

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https://hg.mozilla.org/integration/gaia-central/rev/2da227228f43
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #14339 from huchengtw-moz/video/Bug_945508_bad_playback_layout

Bug 945508 - WebM video with 11:9 aspect ratio has bad playback layout, r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/d30076b78ed8
Author: John Hu <johu@mozilla.com>
Desc: Bug 945508 - WebM video with 11:9 aspect ratio has bad playback layout