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

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https://hg.mozilla.org/integration/gaia-central/rev/1a4264bafaa8
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1074028 - Overlapping rocketbar and statusbar icons for 3rd party apps"

This reverts commit fedc64c00cecbf15f2c961833e090590e907bd1e.
Bumping manifests a=b2g-bump