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

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https://hg.mozilla.org/integration/gaia-central/rev/ec3cab15f129
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1030248 - Localization solution for context menu r=me"

This reverts commit 821af8793575815bd31608b7ff4ad327d7115967.
Bumping manifests a=b2g-bump