Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b1480a4c6393
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #22681 from nmunro/master

Bug 1048021 - Mass replace pageX/pageY to clientX/clientY for keyboard app, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/e24f08253931
Author: Neil Munro <neilmunro@gmail.com>
Desc: Bug 1048021 - Mass replace pageX and pageY to clientX and clientY for keyboard app.

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https://hg.mozilla.org/integration/gaia-central/rev/3917a6d04360
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #22699 from timdream/keyboard-vwrapper-css2

Bug 1048025 - Set pointer-events: none on child elements of keys, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/cfb919f93549
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1048025 - Set pointer-events: none on child elements of keys
Bumping manifests a=b2g-bump