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

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https://hg.mozilla.org/integration/gaia-central/rev/82fb9c548eb8
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #13918 from arcturus/download-delete

Bug 941717 - [Download Manager] Implement a way of removing downloads

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https://hg.mozilla.org/integration/gaia-central/rev/6759fe270036
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Bug 941717 - [Download Manager] Implement a way of removing downloads