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

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https://hg.mozilla.org/integration/gaia-central/rev/79b978feb7b7
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 980861 -[Cost Control] Alarm should be notified when user configures when use is above or when balance is below"

This reverts commit 2344928becec0e744c398f279a233ec27aa90ed5.
Bumping manifests a=b2g-bump