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

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https://hg.mozilla.org/integration/gaia-central/rev/d6d3288db117
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #11068 from dominickuo/bug-857674-new

Bug 857674 - [music] hide sublist and player in search mode, r=RudyLu

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https://hg.mozilla.org/integration/gaia-central/rev/9eb01979b172
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 857674 - [music] hide sublist and player in search mode