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

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https://hg.mozilla.org/integration/gaia-central/rev/ebb38d4126d0
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #12287 from lightsofapollo/reallyreallyhide-keyboard-tets

[really] per bug 917523 disable test on tbpl

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https://hg.mozilla.org/integration/gaia-central/rev/290853690b8c
Author: James Lal <james@lightsofapollo.com>
Desc: [really] per bug 917523 disable test on tbpl