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

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https://hg.mozilla.org/integration/gaia-central/rev/ad2ea4225c79
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #14123 from comoyo/gd_pan_config

Bug 943826 - Make panning thresholds configurable in gesture detector. r=janjongboom

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https://hg.mozilla.org/integration/gaia-central/rev/2e35633c1455
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Bug 943826 - Make panning thresholds configurable in gesture detector