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

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https://hg.mozilla.org/integration/gaia-central/rev/b8c55b884564
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19172 from KevinGrandon/bug_983616_search_marketplace_region

Bug 983616 - [Search] Pass in region for faster marketplace searches

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https://hg.mozilla.org/integration/gaia-central/rev/1e8b904bd489
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 983616 - [Search] Pass in region for faster marketplace searches r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/891a4fe89351
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19132 from KevinGrandon/bug_1008630_system2_bootstrap_fixup

Bug 1008630 - [System2] Bootstrap_test.js fixup

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https://hg.mozilla.org/integration/gaia-central/rev/cea7da534858
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1008630 - [System2] Bootstrap_test.js fixup r=alive
Bumping manifests a=b2g-bump