Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/158c4e7aafe9
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20533 from KevinGrandon/bug_1025586_collection_tests

Bug 1025586 - MarionetteJS Tests for Smart Collections

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https://hg.mozilla.org/integration/gaia-central/rev/093bd1349a61
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1025586 - MarionetteJS Tests for Smart Collections
Bumping manifests a=b2g-bump