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

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https://hg.mozilla.org/integration/gaia-central/rev/f2f6d6a68df9
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #22385 from zacc/bug_1047168

Bug 1047168 - Change test_browser_play_youtube_video.py to run local con...

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https://hg.mozilla.org/integration/gaia-central/rev/6274dfa5b2bc
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1047168 - Change test_browser_play_youtube_video.py to run local content and embedded video
Bumping manifests a=b2g-bump