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

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https://hg.mozilla.org/integration/gaia-central/rev/1e68cf8bff36
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Revert "Merge pull request #17116 from pivanov/bug-968483"

This reverts commit 5024a949f5a63dac3abf769264077191d9436010, reversing
changes made to 6f49249b429095064df345c9b24c00f4d7960972.
Bumping manifests a=b2g-bump