Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6b1d1bb5852f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #24408 from KevinGrandon/bug_1054778_rocketbar_height_width

Bug 1054778 - [Rocketbar] Visual polish

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https://hg.mozilla.org/integration/gaia-central/rev/80bf4143727a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1054778 - [Rocketbar] Visual polish r=eli
Bumping manifests a=b2g-bump