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

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https://hg.mozilla.org/integration/gaia-central/rev/8ff42fad2e15
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #13367 from stupchiy/issue_933075

Bug 933709 - Write test for geolocation prompt

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https://hg.mozilla.org/integration/gaia-central/rev/1f2265e62705
Author: Sergey Tupchiy <sergey.tupchiy@optile.de>
Desc: Bug 933709 - Write test for geolocation prompt