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

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https://hg.mozilla.org/integration/gaia-central/rev/fd3f3b5f3921
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #11579 from cctuan/903348

Bug 903348 - [Gallery] HD Video play icon is blurry r=davidflanagan

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https://hg.mozilla.org/integration/gaia-central/rev/da0d8a586221
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 903348 - [Gallery] HD Video play icon is blurry

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https://hg.mozilla.org/integration/gaia-central/rev/e32c81b5c0d2
Author: b2gautomation <jonallengriffin@gmail.com>
Desc: Bug 907941 - gaia-ui-tests-pushbot (see bug)