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

========

https://hg.mozilla.org/integration/gaia-central/rev/3cba4b552c2c
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #21893 from etiennesegonzac/bug-1040342

Bug 1040342 - Follow up to bug 1039199 with tests r=Rik

========

https://hg.mozilla.org/integration/gaia-central/rev/43522bbfef5b
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1040342 - Follow up to bug 1039199 with tests

========

https://hg.mozilla.org/integration/gaia-central/rev/a165c5ae3bfc
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #21877 from etiennesegonzac/bug-1036642

Bug 1036642 - Enable access to the rocketbar while on a call. r=21

========

https://hg.mozilla.org/integration/gaia-central/rev/49c1ff2a605c
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1036642 - Enable access to the rocketbar while on a call.
Bumping manifests a=b2g-bump