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

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https://hg.mozilla.org/integration/gaia-central/rev/ec8167c993cf
Author: Francisco Jordano <fjordano@mozilla.com>
Desc: Revert "Bug 1039189 - [User Story] Access connectivity settings when offline in search UI r=kgrandon"

This reverts commit df2f863018446a5e8419d348c3271e092c4ac903.
Bumping manifests a=b2g-bump