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

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https://hg.mozilla.org/integration/gaia-central/rev/63436aa17e7f
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #25097 from julienw/1082064-prevent-double-domcontentloaded

Bug 1082064 - [Messages] Prevent double DOMContentLoaded events r=schung

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https://hg.mozilla.org/integration/gaia-central/rev/b9c9bc4a82c1
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1082064 - [Messages] Prevent double DOMContentLoaded events r=schung
Bumping manifests a=b2g-bump