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

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https://hg.mozilla.org/integration/gaia-central/rev/4f00231c5cc5
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #16193 from crh0716/958736

Bug 958736 - Move the localization logic to LockScreenConnInfoManager r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/2c46d671757c
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 958736 - Move the localization logic to LockScreenConnInfoManager

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https://hg.mozilla.org/integration/gaia-central/rev/bcedbf5ab53b
Author: RickyChien <ricky060709@gmail.com>
Desc: Merge pull request #13408 from RickyChien/issue-934952

Bug 934952 - Add test-agent coverage report into allow-failures of Travis CI. r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/766af2e57ac0
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Bug 934952 - Add test-agent coverage report into allow-failures of Travis CI
Bumping manifests a=b2g-bump