Bumping gaia.json for 1 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/8637e29fffcb
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 890079 - Homescreen grid tests failing in TBPL with: document.createTouch is not a function r=crdlc

don't try to send touch events if document.createTouch is missing.