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

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https://hg.mozilla.org/integration/gaia-central/rev/6849008b3aa0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15885 from KevinGrandon/bug_966592_nightly_errors

Bug 966592 - Remove logged errors for DEBUG profiles r=fabrice

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https://hg.mozilla.org/integration/gaia-central/rev/0a127e617015
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 966592 - Remove logged errors for DEBUG profiles r=fabrice
Bumping manifests a=b2g-bump