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

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https://hg.mozilla.org/integration/gaia-central/rev/22a1aea11597
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #10672 from JonHylands/jhylands-887654-big-threads-in-all-workloads-master

Bug 887654 - Changed 200, 500, and 1000 sized sms/mms reference workloads to use BIG-THREAD model
r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/afe4bfbd4c7c
Author: Jon Hylands <jhylands@mozilla.com>
Desc: Bug 887654 - Changed 200, 500, and 1000 sized sms/mms reference workloads to use BIG-THREAD model

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https://hg.mozilla.org/integration/gaia-central/rev/e39b404ac01c
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Merge pull request #10581 from reubenmorais/master

Bug 885979 - Add a setting for enabling Contacts debugging output at runtime. r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/877309261bfa
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Bug 885979 - Add preference to enable Contacts API debugging. r=evelyn