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

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https://hg.mozilla.org/integration/gaia-central/rev/c9227463df42
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #17959 from benfrancis/970935

Bug 970935 - Display Rocketbar in expanded state on homescreen r=alive r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/ba9b0fc91b96
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 970935 - Display Rocketbar in expanded state on homescreen
Bumping manifests a=b2g-bump