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

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https://hg.mozilla.org/integration/gaia-central/rev/dc6f8c3464f8
Author: Arno Puder <arno@puder.org>
Desc: Merge pull request #22599 from svic/Bug_1043856

Bug 1043856 - Increase connection timeout

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https://hg.mozilla.org/integration/gaia-central/rev/323d355a8a61
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22643 from KevinGrandon/bug_1042012_rocketbar_activities

Bug 1042012 - [Rocketbar] View URL activity should be handled by the system app

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https://hg.mozilla.org/integration/gaia-central/rev/2162df91f85a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1042012 - [Rocketbar] View URL activity should be handled by the system app r=vingtetun r=yurenju r=qdot
Bumping manifests a=b2g-bump