Bumping gaia.json for 2 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/0011bf2958bb
Author: Malini Das <thehyperballad@gmail.com>
Desc: Merge pull request #14760 from malini/v1.3mixin

Reland Uplifted changes for Bug 925398 (includes Bug 945284, Bug 947001)

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https://hg.mozilla.org/integration/gaia-1_3/rev/46b1bcb76d41
Author: Malini Das <mdas@mozilla.com>
Desc: Reland Uplifted changes for Bug 925398 (includes Bug 945284, Bug 947001)