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

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https://hg.mozilla.org/integration/gaia-central/rev/0908aa88a008
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20382 from KevinGrandon/bug_1023714_vertical_cancel_localization

Bug 1023714 - [vertical homescreen] Cancel button is not localized after a long press on the homescreen

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https://hg.mozilla.org/integration/gaia-central/rev/aaa8b4eeb7ef
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1023714 - [vertical homescreen] Cancel button is not localized after a long press on the homescreen

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https://hg.mozilla.org/integration/gaia-central/rev/48adf9657998
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1021735 - [Flame] Investigate and fix failure in test_import_contacts_from_sdcard.py
Bumping manifests a=b2g-bump