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

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https://hg.mozilla.org/integration/gaia-central/rev/7bfb4efb6e67
Author: huchengtw-moz <johu@mozilla.com>
Desc: Merge pull request #10363 from huchengtw-moz/video/Bug_879362_when_youtube_video_complete_ux_is_ambiguous

Bug 879362 - [A/V][video] When YouTube video completes, UX (Pause button...r=@djf

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https://hg.mozilla.org/integration/gaia-central/rev/a61eb11d24d4
Author: John Hu <johu@mozilla.com>
Desc: Bug 879362 - [A/V][video] When YouTube video completes, UX (Pause button, timer) is ambiguous