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

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https://hg.mozilla.org/integration/gaia-central/rev/3706144d0cdf
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 934531 - [Messages] The Visual Design is incorrect for the contact card r=schung

This changes how we render a contact in the Messages app.

* adjust to the latest visual specification for the contact header (not for the
  "not contact" header): light font variant, new padding

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https://hg.mozilla.org/integration/gaia-central/rev/5b9495f47986
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #14093 from eeejay/bug-943176

Bug 943176 - [Settings] Fix full line :active highlights.

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https://hg.mozilla.org/integration/gaia-central/rev/68cd1fde010d
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 943176 - [Settings] Fix full line :active highlights.