Bumping gaia.json for 3 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/d5d2b5614c32
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #15078 from gaye/only-run-travis-on-master

Only run travis on master for now

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https://hg.mozilla.org/integration/gaia-central/rev/991ac53de6d3
Author: Gareth Aye <gaye@mozilla.com>
Desc: Only run travis on master for now

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https://hg.mozilla.org/integration/gaia-central/rev/9796bc206da3
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Revert "Bug 944697 - Make the edge_gesture_test.js resolution independent. r=alive"

This reverts commit 5f67e563ef9eb52ee33cc76ac73ffe3dccdc3296.