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

========

https://hg.mozilla.org/integration/gaia-central/rev/eff0b3c7b166
Author: b2gautomation <jonallengriffin@gmail.com>
Desc: Bug 907941 - gaia-ui-tests-pushbot (see bug)

========

https://hg.mozilla.org/integration/gaia-central/rev/669f81b5350d
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: Merge pull request #11781 from EverythingMe/replace-api-key

[Bug 909716] replace api key [r=crdlc]

========

https://hg.mozilla.org/integration/gaia-central/rev/629beaf543a9
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: [Bug 909716] replace api key [r=crdlc]