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

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https://hg.mozilla.org/integration/gaia-central/rev/bff34cad1570
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #19419 from gtorodelvalle/comms-bug-985995-new-header-for-comms-reloaded

Bug 985995 - BB . Visual Refresh. Create separate headers for Comms Apps

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https://hg.mozilla.org/integration/gaia-central/rev/f7fa3e506771
Author: German Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 985995 - BB . Visual Refresh. Create separate headers for Comms Apps

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https://hg.mozilla.org/integration/gaia-central/rev/ec3e9c071ec0
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 1006801 - Disable places provider if rocketbar isnt enabled. r=kgrandon
Bumping manifests a=b2g-bump