Bumping gaia.json for 7 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/c8b0ba6af3a6
Author: John Ford <john@johnford.info>
Desc: Merge pull request #10800 from karlcow/master

Remove UA override for different domains

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https://hg.mozilla.org/integration/gaia-central/rev/3c187800fcb8
Author: karl <karl+github@la-grange.net>
Desc: 892001 - Remove UA override for thinkgeek.com

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https://hg.mozilla.org/integration/gaia-central/rev/42c68f7ddef1
Author: karl <karl+github@la-grange.net>
Desc: 891998 - Remove UA override for ceneo.pl

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https://hg.mozilla.org/integration/gaia-central/rev/a1f3069af5eb
Author: karl <karl+github@la-grange.net>
Desc: 891997 - Remove UA override for tam.com.br

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https://hg.mozilla.org/integration/gaia-central/rev/609cdda6f279
Author: karl <karl+github@la-grange.net>
Desc: 891994 - Remove UA override for clickjogos.uol.com.br

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https://hg.mozilla.org/integration/gaia-central/rev/5ccbf08b01b4
Author: karl <karl+github@la-grange.net>
Desc: 890288 - Remove UA override for espn.go.com

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https://hg.mozilla.org/integration/gaia-central/rev/0797352c9b4e
Author: Lawrence Mandel <lmandel@mozilla.com>
Desc: Bug 881847 - Remove UA override for imdb.com r=fabrice