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

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https://hg.mozilla.org/integration/gaia-central/rev/16edff8f2d1e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1042105 - [User Story] Icon prioritization in the status bar"

This reverts commit 7e4678128cdd6d296b67679fbe827845d19e7ec7.
Bumping manifests a=b2g-bump