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

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https://hg.mozilla.org/integration/gaia-central/rev/c6e7e185943d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18903 from KevinGrandon/bug_1005311_update_css_error_count

Bug 1005311 - Update css error count

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https://hg.mozilla.org/integration/gaia-central/rev/69741d5406b6
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1005311 - Update css error count
Bumping manifests a=b2g-bump