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

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https://hg.mozilla.org/integration/gaia-central/rev/0f726fb0f0d0
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #12750 from AndreiH/bug924880

Bug 924880 - Need an extra wait in test_unlock_to_camera_with_passcode

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https://hg.mozilla.org/integration/gaia-central/rev/b9adda873c1e
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 924880 - Need an extra wait in test_unlock_to_camera_with_passcode

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https://hg.mozilla.org/integration/gaia-central/rev/499d41635070
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #12226 from darchons/bug916205-create-and-enable-dynamic-ua

Remove UA override list from Gaia

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https://hg.mozilla.org/integration/gaia-central/rev/c1d6ea5cb194
Author: Jim Chen <nchen@mozilla.com>
Desc: Bug 916205 - Remove UA override list from Gaia; r=fabrice