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

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https://hg.mozilla.org/integration/gaia-central/rev/3cd4338ec1f0
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #18262 from justindarc/bug995632

Bug 995632 - [camera] zoom gesture sensitivity is depends on screen reso...

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https://hg.mozilla.org/integration/gaia-central/rev/9a37c720b88f
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 995632 - [camera] zoom gesture sensitivity is depends on screen resolution

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https://hg.mozilla.org/integration/gaia-central/rev/de8b7e9fa627
Author: Borja Salguero <borjasalguero@users.noreply.github.com>
Desc: Merge pull request #18292 from borjasalguero/revert_regression_mms

Revert "Bug 926385 - [Messages] saner button css rules r=julien"

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https://hg.mozilla.org/integration/gaia-central/rev/0c3c8ec56bec
Author: borjasalguero <fbsc@tid.es>
Desc: Revert "Bug 926385 - [Messages] saner button css rules r=julien"

This reverts commit 12fa8c5290f9073d4fcc530c398e446aa36bddf8.
Bumping manifests a=b2g-bump