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

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https://hg.mozilla.org/integration/gaia-central/rev/7a448a29d52b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 996662 - Disable intermittent failing test, Places tests Search for a string that doesnt match visited url

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https://hg.mozilla.org/integration/gaia-central/rev/889a64daf01f
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #18124 from arcturus/fdnMessage-bug978130

Bug 978130 - [FDN] Misleading SMS message

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https://hg.mozilla.org/integration/gaia-central/rev/04a8865e4b7f
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Bug 978130 - [FDN] Misleading SMS message

If the SMS call center is not in the FDN list, no SMS can be sent
 - no matter if the recipients are in the FDN list or not.
Here is a less misleading error message.
Bumping manifests a=b2g-bump