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

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https://hg.mozilla.org/integration/gaia-central/rev/ab89af5179c8
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #11779 from huchengtw-moz/video/Bug_908531_move_dummy_file_filter_to_video

Bug 908531 - [MediaDB] move the dummy file filter out of mediadb and use..., r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/d9edf0e82d68
Author: John Hu <johu@mozilla.com>
Desc: Bug 908531 - [MediaDB] move the dummy file filter out of mediadb and use options to supply it.