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

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https://hg.mozilla.org/integration/gaia-central/rev/0168c620b526
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #25234 from justindarc/bug1079543

Bug 1079543 - Preview is getting freeze after opening & closing Camera a...

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https://hg.mozilla.org/integration/gaia-central/rev/a29ff7766603
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1079543 - Preview is getting freeze after opening & closing Camera app during WEBRTC video call

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https://hg.mozilla.org/integration/gaia-central/rev/c39f765bb8d0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25341 from KevinGrandon/bug_1085460_tc_gaia_integration_manifest

Bug 1085460 - taskcluster: Run tests with correct TBPL manifest

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https://hg.mozilla.org/integration/gaia-central/rev/14af59f56c57
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1085460 - taskcluster: Run tests with correct TBPL manifest r=kgrandon a=testonly
Bumping manifests a=b2g-bump