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

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https://hg.mozilla.org/integration/gaia-central/rev/500287afb181
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #10601 from comoyo/keyboard_landscape

Bug 884703 - Remove inline styles on visual keys if present. r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/9944b7ab0f83
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Bug 884703 - Remove inline styles on visual keys if present