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

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https://hg.mozilla.org/integration/gaia-central/rev/4cfbd89887bd
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #11680 from alivedise/bugzilla/907470/modal-dialog-select-one-style

Bug 907470 - Fix modal dialog select one style, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/82bb81e4f579
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 907470 - Fix modal dialog select one style

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https://hg.mozilla.org/integration/gaia-central/rev/7c775cb0b78c
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #11679 from alivedise/bugzilla/904971/screen-manager-unit-test-fail

Bug 904971 - Fix unit test of screen manager, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/e460c4bd2041
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 907669 - Fix unit test of screen manager