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

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https://hg.mozilla.org/integration/gaia-central/rev/2486d605b20a
Author: russnicoletti <rnicoletti@mozilla.com>
Desc: Merge pull request #21460 from russnicoletti/toggleVideoControls_unit_tests

 Bug 979636 - Unit tests for video app: toggleVideoControls, setControlsVisibility r=johu

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https://hg.mozilla.org/integration/gaia-central/rev/d56b32763d1f
Author: Russ Nicoletti <rnicoletti@mozilla.com>
Desc:  Bug 979636 - Unit tests for video app: toggleVideoControls, setControlsVisibility

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https://hg.mozilla.org/integration/gaia-central/rev/572b7ccede0e
Author: Zibi Braniecki <zbigniew.braniecki@gmail.com>
Desc: Merge pull request #21548 from zbraniecki/1022859-factorize-parser-into-a-class

Bug 1022859 - Factorize parser into a class. r=stas

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https://hg.mozilla.org/integration/gaia-central/rev/892c1ade82d9
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 1022859 - Prepare l10n.js for l20n file format
Bumping manifests a=b2g-bump