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

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https://hg.mozilla.org/integration/gaia-central/rev/e8b3281b9e2c
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #10747 from gaye/bug-889405

Bug 889405 - Remove broken css r=lightsofapollo

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https://hg.mozilla.org/integration/gaia-central/rev/b14d5bbe1c3f
Author: gaye <gaye@mozilla.com>
Desc: Bug 889405 - Remove broken css