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

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https://hg.mozilla.org/integration/gaia-central/rev/472186e22eb4
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #22367 from vingtetun/browser-color-landing2

Bug 1046099 - Use a different color for the system browser chrome. r=kgr...

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https://hg.mozilla.org/integration/gaia-central/rev/0fd82e0dd656
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1046099 - Use a different color for the system browser chrome. r=kgrandon
Bumping manifests a=b2g-bump