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

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https://hg.mozilla.org/integration/gaia-central/rev/7f81d74e2073
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1041539 - Rocketbar.js, TypeError: this.handleStackChanged is not a function r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/250d9feaa16b
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #21993 from viorelaioia/bug-1021732

Bug 1021732 - [Flame] Re-enable test_privileged_app_contacts_prompt

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https://hg.mozilla.org/integration/gaia-central/rev/63fe9f499649
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1021732 - [Flame] Re-enable test_privileged_app_contacts_prompt
Bumping manifests a=b2g-bump