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

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https://hg.mozilla.org/integration/gaia-central/rev/3c7a9041d94d
Author: Florin Strugariu <florin.strugariu@softvision.ro>
Desc: Merge pull request #26885 from viorelaioia/bug_1110218

Bug 1110218 - Investigate intermittent failure in test_redial_last_numbe...

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https://hg.mozilla.org/integration/gaia-central/rev/9ef859b524c0
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1110218 - Investigate intermittent failure in test_redial_last_number.py

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https://hg.mozilla.org/integration/gaia-central/rev/3c6d71b5fd4c
Author: Florin Strugariu <florin.strugariu@softvision.ro>
Desc: Merge pull request #26886 from npark-mozilla/1112758

Bug 1112758 - Create a new test case for the switching to camera from gallery's list view

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https://hg.mozilla.org/integration/gaia-central/rev/0235d0de2061
Author: No-Jun <npark@mozilla.com>
Desc: Bug 1112758 - Create a new test case for the switching to camera from gallery's list view
Bumping manifests a=b2g-bump