Bumping gaia.json for 3 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/ffe6be3d548b
Author: Ed Morley <emorley@mozilla.com>
Desc: Revert "Bug 903913 - [Flatfish]Need script to detect device type for reuse in shared folder" for breaking the build

This reverts commit 8d38c52846818b0cf6f16fed7fcc4eae47c940b1.

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https://hg.mozilla.org/integration/gaia-central/rev/0bb4ced54eaf
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #11645 from comoyo/new_ime_webidl

Bug 906096 - Switch InputMethod to WebIDL in IME tests and FF Nightly. r=RudyL

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https://hg.mozilla.org/integration/gaia-central/rev/712c08778490
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Bug 906096 - Switch InputMethod to WebIDL in IME tests and FF Nightly