Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b3e4bc16766f
Author: Zibi Braniecki <zbigniew.braniecki@gmail.com>
Desc: Merge pull request #22408 from zbraniecki/1047344-clean-up-mozl10n-api-in-browser

Bug 1047344 - Clean up mozL10n API use in Browser. r=dale

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https://hg.mozilla.org/integration/gaia-central/rev/1b347cb38aa0
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 1047344 - Clean up mozL10n API use in Browser
Bumping manifests a=b2g-bump