Bumping gaia.json for 3 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/10a13bb495e2
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #15190 from timdream/lockscreen-secure-camera

Bug 958425 - Stop copying Camera app to System app, r=alive, r=johu, r=yuren

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https://hg.mozilla.org/integration/gaia-central/rev/6b22e52bb507
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 958425 - Camera app.js tests

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https://hg.mozilla.org/integration/gaia-central/rev/d7bc748a072d
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 958425 - Stop copying Camera app to System app