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

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https://hg.mozilla.org/integration/gaia-central/rev/410add7c899d
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #13406 from etiennesegonzac/bug-919492-app-to-app-edge-gesture

Bug 919492 - Adding edge gestures for app-to-app fast switching. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/9b0f1ca46188
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 919492 - Adding edge gestures for app-to-app fast switching.
Pref-ed off behind the edgesgesture.enabled setting.
r=alive