Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/c6ade2835b99
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #20671 from AndreiH/bug_1026971

Bug 1026971 - Xfail persona test

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https://hg.mozilla.org/integration/gaia-central/rev/63b4bac173bf
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 1026971 - Xfail persona test

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https://hg.mozilla.org/integration/gaia-central/rev/f77eff3ca1f7
Author: AndreiH <andrei.hutusoru@softvision.ro>
Desc: Merge pull request #20665 from zacc/bug_1026949

Bug 1026949 - Update locator and code in emergency call test case

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https://hg.mozilla.org/integration/gaia-central/rev/9cbb975da977
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1026949 - Update locator and code in emergency call test case

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https://hg.mozilla.org/integration/gaia-central/rev/3d1d352f78b4
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #20559 from alivedise/bugzilla/1021583_2.1/resize-when-switch-apps

Bug 1021583 - update active app while switching apps, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/37fe4c9d131c
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1021583 - update active app while switching apps
Bumping manifests a=b2g-bump