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

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https://hg.mozilla.org/integration/gaia-central/rev/6dd93f9a63b6
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #20917 from lightsofapollo/bug-1029329

Bug 1029329 - After downloading an app with a role we consider hidden re...

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https://hg.mozilla.org/integration/gaia-central/rev/b2a993601cad
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 1029329 - After downloading an app with a role we consider hidden remove it from the grid

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https://hg.mozilla.org/integration/gaia-central/rev/0d1841f0ca75
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1026387 - [Dialer][Call log] 'missed' highlighted when tapping edit and back, then tapping 'all'"

This reverts commit 4fd21dac243e496c2a027cda5a1b9d1e97f41b22.
Bumping manifests a=b2g-bump