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

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https://hg.mozilla.org/integration/gaia-1_3/rev/3e0110821054
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Revert "Merge pull request #14810 from etiennesegonzac/bug-946316-mochitest"

This reverts commit b1e86026b3d3b710cd1486c25daca85cffb8a331.