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

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https://hg.mozilla.org/integration/gaia-central/rev/da85955beafd
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #18749 from EverythingMe/bug1002470

[Bug 1002470] Support for extra page on left [r=ranbena]

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https://hg.mozilla.org/integration/gaia-central/rev/1fea6cc32dc5
Author: Amir Nissim <amirnissim@gmail.com>
Desc: [Bug 1002470] Support for extra page on left [r=ranbena]
Bumping manifests a=b2g-bump