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

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https://hg.mozilla.org/integration/gaia-central/rev/186dc9242740
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #17766 from julienw/revert-bad-revert

Revert "Revert "Merge pull request #17263 from gasolin/bubble-merge225" ...

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https://hg.mozilla.org/integration/gaia-central/rev/fc3ccbc1f7e1
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 989418 - Revert "Revert "Merge pull request #17263 from gasolin/bubble-merge225" for possibly breaking gaia-ui tests on TBPL"

This reverts commit a9aa1882f4b0e472f3686b157eb119d17ae60a91.
The original revert broke a lot of things and was not done correctly.

Conflicts:
	apps/clock/js/panels/timer/panel.html
	shared/style_unstable/input_areas.css

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https://hg.mozilla.org/integration/gaia-central/rev/b82006c4b2c8
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #17809 from davehunt/bug989951

Bug 989951 - Bump gaiatest version to 0.21.10

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https://hg.mozilla.org/integration/gaia-central/rev/1c5240dd926d
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 989951 - Bump gaiatest version to 0.21.10. r=fstrugariu
Bumping manifests a=b2g-bump