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

========

https://hg.mozilla.org/integration/gaia-central/rev/08b27cc9d095
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #10897 from fzzzy/master

Bug 887454 Remove UA override for youtube.com r=benfrancis

========

https://hg.mozilla.org/integration/gaia-central/rev/6dec3dcf2176
Author: Donovan Preston <donovanpreston@gmail.com>
Desc: bug 887454 Remove ua override for youtube.com