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

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https://hg.mozilla.org/integration/gaia-central/rev/b87eb11393b9
Author: ochameau <poirot.alex@gmail.com>
Desc: Merge pull request #10440 from ochameau/touch-scroll

Bug 883834 - Touch events position is wrong on desktop when a DOM element is scrollable r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/a5fa8b409586
Author: Alexandre Poirot <poirot.alex@gmail.com>
Desc: Bug 883834 - Touch events position is wrong on desktop when a DOM element is scrollable