Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/9d9dfbc39ce6
Author: Sam Joch <samuel@guiora.com>
Desc: Merge pull request #11810 from epang/bug910166_add_missing_browser_graphics

Bug 910166 - Add Missing Browser Graphics r=samjoch

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https://hg.mozilla.org/integration/gaia-central/rev/8b82cb30cfba
Author: Eric Pang <epang@mozilla.com>
Desc: Bug 910166 - Add Missing Browser Graphics