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

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https://hg.mozilla.org/integration/gaia-central/rev/d3b51d9401ac
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #18254 from evanxd/bug-995567

Bug 995567 - Remove the useless files.

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https://hg.mozilla.org/integration/gaia-central/rev/7c0f6d30d517
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 995567 - Remove calendar.js.
Bumping manifests a=b2g-bump