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

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https://hg.mozilla.org/integration/gaia-central/rev/ec77324395be
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #12018 from huchengtw-moz/video/Bug_913387_the_video_will_back_to_start

Bug 913387 - [Buri][Monitor][Video]The video will back to start when inv..., r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/02b2e49f8e17
Author: John Hu <johu@mozilla.com>
Desc: Bug 913387 - [Buri][Monitor][Video]The video will back to start when invoking recent app