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

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https://hg.mozilla.org/integration/gaia-central/rev/bedb6b51cb7d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1024993 -  Run the CSS Linter in Travis/TBPL"

This reverts commit 6afc2da504ecccd4c0906a2f7fed962b0163535b.

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https://hg.mozilla.org/integration/gaia-central/rev/eb38f4a29c7a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1024993 - Update CSS xfail list to be green"

This reverts commit dade090fc3299af85a19b5930d4720c203c3e43e.
Bumping manifests a=b2g-bump