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

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https://hg.mozilla.org/integration/gaia-central/rev/9e7b27494d61
Author: Olav Nymoen <olav@comoyo.com>
Desc: Merge pull request #11251 from comoyo/replaceable_homescreen

Bug 898330 - Add a panel in the Settings app in order to switch homescreens. r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/ad23abaf8f70
Author: Olav Nymoen <olav@comoyo.com>
Desc: Bug 898330 - Add a panel in the Settings app in order to switch homescreens. r=vingtetun