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

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https://hg.mozilla.org/integration/gaia-central/rev/cb88547a0ab4
Author: dwi2 <dwi2@dwi2.com>
Desc: Merge pull request #14246 from dwi2/bug945087

Bug 945087 - Fix typo in css

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https://hg.mozilla.org/integration/gaia-central/rev/415681eac39e
Author: tzhuang <tzhuang@mozilla.com>
Desc: Bug 945087 - Fix typo in css