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

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https://hg.mozilla.org/integration/gaia-central/rev/292078cac8cf
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #13334 from masap/20131104

Bug 934312 - [Homescreen] Remove CSS errors

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https://hg.mozilla.org/integration/gaia-central/rev/92d7383d3003
Author: masap <masashi.honma@gmail.com>
Desc: Bug 934312 - [Homescreen] Remove CSS errors