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

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https://hg.mozilla.org/integration/gaia-central/rev/9117e02cb36a
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #19759 from dominickuo/bug-937937-all

Bug 937937 - [All] Set proper volumeControlChannel to AudioChannelManager in all the core apps, r=alivedise

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https://hg.mozilla.org/integration/gaia-central/rev/677f6ab8b374
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 937937 - [All] Set proper volumeControlChannel to AudioChannelManager in all the core apps
Bumping manifests a=b2g-bump