Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4198778c9093
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #21084 from KevinGrandon/bug_1028452_smart_collection_geolocation

Bug 1028452 - [Collections] Opening a smart collection is slow

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https://hg.mozilla.org/integration/gaia-central/rev/0d7dda4a7eda
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1028452 - [Collections] Opening a smart collection is slow r=ranbena

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https://hg.mozilla.org/integration/gaia-central/rev/1b3480d19f3a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20984 from EverythingMe/1030219-init-refactor

Bug 1030219 - [Collection app] Pinned installed apps delayed rendering

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https://hg.mozilla.org/integration/gaia-central/rev/bebaf0473a46
Author: Ran Ben Aharon <ran@ranbena.com>
Desc: Bug 1030219 - [Collection app] Pinned installed apps delayed rendering r=kgrandon
Bumping manifests a=b2g-bump