Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/6cf49c161c55
Author: Dale  Harvey <dale@arandomurl.com>
Desc: Merge pull request #10142 from daleharvey/837672

Bug 837672 - Add events to track camera startup performance. r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/28fcd12f6ef1
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 837672 - Add events to track camera startup performance