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

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https://hg.mozilla.org/integration/gaia-central/rev/84aeb6eb9ddd
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #22100 from snowmantw/issue1043103

Bug 1043103 - [Lockscreen] Implement actionable LockScreen notifications

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https://hg.mozilla.org/integration/gaia-central/rev/8186787f6fd7
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1043103 - [Lockscreen] Implement actionable LockScreen notifications

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https://hg.mozilla.org/integration/gaia-central/rev/d579ecc95296
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #20905 from pivanov/bug-1026698

Bug 1026698 - (2.0-visual-refresh)[Ringtones] Add & Set New System Notifications r=squib

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https://hg.mozilla.org/integration/gaia-central/rev/37edf836059f
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1026698 - (2.0-visual-refresh)[Ringtones] Add & Set New System Notifications

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https://hg.mozilla.org/integration/gaia-central/rev/fcae27f7f343
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #23060 from dominickuo/bug-1040712

Bug 1040712 - [System] use same silent style icon for status bar and sound manager, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/a48d5e795a23
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 1040712 - [System] use same silent style icon for status bar and sound manager
Bumping manifests a=b2g-bump