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

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https://hg.mozilla.org/integration/gaia-central/rev/d8988d36478a
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 962612 - View date grouped history results. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/67af94277f2a
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #23326 from arcturus/ice_save

Bug 1042584 - [Contacts][ICE] Select the contact from the list

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https://hg.mozilla.org/integration/gaia-central/rev/e5916d24da4d
Author: Francisco Jordano <fjordano@mozilla.com>
Desc: Bug 1042584 - [Contacts][ICE] Select the contact from the list r=sergi
Bumping manifests a=b2g-bump