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

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https://hg.mozilla.org/integration/gaia-central/rev/e86094bf04fc
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Revert "Merge pull request #17164 from mcjimenez/bug978785"

This reverts commit 73c3a1305da4a949c1634a009c400bc2431848d2, reversing
changes made to 9f4de77d34987e5e10fdc1abe374937b953af70d.
Bumping manifests a=b2g-bump