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

========

https://hg.mozilla.org/integration/gaia-central/rev/204d793347d1
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #10500 from dominickuo/bug-884722

Bug 884722 - [music] support amr for open activity, r=timdream

========

https://hg.mozilla.org/integration/gaia-central/rev/d14a7daf171c
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 884722 - [music] support amr for open activity