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

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https://hg.mozilla.org/integration/gaia-central/rev/e205210d717b
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #13868 from crdlc/bug-940966

Bug 940966 - [Download Manager] [DownloadFormatter] The field started is...

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https://hg.mozilla.org/integration/gaia-central/rev/82620d9f3078
Author: crdlc <crdlc@tid.es>
Desc: Bug 940966 - [Download Manager] [DownloadFormatter] The field started is startTime in the API