Bumping gaia.json for 3 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6fded6e1ce02
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15132 from KevinGrandon/bug_957418_resolve_invalid_commit

Bug 957418 - Enable rocketbar development in browser

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https://hg.mozilla.org/integration/gaia-central/rev/4c0643445ce9
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 957418 - Fix interapp communication API for Rocketbar

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https://hg.mozilla.org/integration/gaia-central/rev/83bc28517207
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 957418 - Fix interapp communication API for Rocketbar"

This reverts commit 6e12bf5d7537e156e7acbee20e9936d9d4677b9a.