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

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https://hg.mozilla.org/integration/gaia-central/rev/b3bbcbb9026c
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #11446 from alivedise/bugzilla/900420_master

Bug 900420 - Remove mozTT reference, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/74e77eaec10f
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 900420 - Remove mozTT reference

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https://hg.mozilla.org/integration/gaia-central/rev/84d84ed85cec
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #10877 from crh0716/881862

Bug 881862 - Control the network type from the json file

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https://hg.mozilla.org/integration/gaia-central/rev/b122f126a233
Author: crh0716 <crh0716@gmail.com>
Desc: Bug 881862 - Control the network type from the json file