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

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https://hg.mozilla.org/integration/gaia-central/rev/d083935e0bc6
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #22889 from mozmark/bug1049071

Bug 1049071 - Track using watchPosition to better throttle geolocation.

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https://hg.mozilla.org/integration/gaia-central/rev/d137555d8333
Author: Mark Goodwin <mgoodwin@mozilla.com>
Desc: Bug 1049071 - Track using watchPosition to better throttle geolocation.
Bumping manifests a=b2g-bump