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

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https://hg.mozilla.org/integration/gaia-central/rev/92d84ad9e66e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #21121 from KevinGrandon/AntonioMA-bug1027708_3

Bug 1027708 - Delay setting the collection datastore listeners until the datastore initial read

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https://hg.mozilla.org/integration/gaia-central/rev/f2e61e76c151
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1027708 - Disable test_cleanup_gaia for mac r=me"

This reverts commit f8fa13796f95e57e814bf5e72fce73f2aecb67f4.

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https://hg.mozilla.org/integration/gaia-central/rev/f6ab7c3f7075
Author: Antonio M. Amaya <amac@tid.es>
Desc: Bug 1027708 - Delay setting the collection datastore listeners until the datastore initial read r=kgrandon
Bumping manifests a=b2g-bump