Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/12c0cf7f2642
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #11534 from benfrancis/808732-2

Bug 808732 - Enable user to change default search provider in browser r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/07454593e644
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 808732 - Enable user to change default search provider in browser

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https://hg.mozilla.org/integration/gaia-central/rev/278314e2e138
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #11426 from comoyo/new_ime

Bug 902562 - Expose new InputMethod API to desktop helper. r=RudyL

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https://hg.mozilla.org/integration/gaia-central/rev/59b6f0b89cdd
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Bug 902562 - Add tests for the InputMethod API