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

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https://hg.mozilla.org/integration/gaia-central/rev/6924b8dba539
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #25425 from crh0716/1087845

Bug 1087845 - Dispatch the visually complete event after the inserted DOM is localized r=eragonj

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https://hg.mozilla.org/integration/gaia-central/rev/aabca3059f75
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1087845 - Dispatch the visually complete event after the inserted DOM is localized
Bumping manifests a=b2g-bump