Bumping gaia.json for 8 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4aaf81f2595a
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #19811 from timdream/keyboard-layout-state

 Bug 1015643 - Unify layout activation to updateCurrentLayout() and use LayoutManger & Loader, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/6898558d3c12
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1015643 - (Part V) Width = 3 for number layouts

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https://hg.mozilla.org/integration/gaia-central/rev/e5a24aa37258
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1015643 - (Part IV) Unify layout activation to updateCurrentLayout()

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https://hg.mozilla.org/integration/gaia-central/rev/a721fc8d9509
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1015643 - (Part V) Use LayoutManager

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https://hg.mozilla.org/integration/gaia-central/rev/648ec39b21fd
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1015643 - (Part IV) Use LayoutLoader in keyboard.js

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https://hg.mozilla.org/integration/gaia-central/rev/3e68c9cc9ee0
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1015643 - (Part III) Include layout_manager.js in keyboard.js

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https://hg.mozilla.org/integration/gaia-central/rev/f9fe830c23a4
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1015643 - (Part II) Implement LayoutManager

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https://hg.mozilla.org/integration/gaia-central/rev/19054e67aab1
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1015643 - (Part I) Implement LayoutLoader for loading layouts
Bumping manifests a=b2g-bump