Bumping gaia.json for 7 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/363fb6d43dbf
Author: KWierso <kwierso@gmail.com>
Desc: Revert "Merge pull request #21806 from Cwiiis/fixed-position-utility-tray" for Gip test failures

This reverts commit 92dd8cc758614123a62376a56458259f4fd77a23, reversing
changes made to 7104d2996b9ad65d9fff57ada454699d3348f0a5.

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https://hg.mozilla.org/integration/gaia-central/rev/d21965106075
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #21598 from 6a68/bug-1036030-fxa-l10n-html

Bug 1036030 - Introduce shared L10nHelper for inserting HTML into l10n p...

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https://hg.mozilla.org/integration/gaia-central/rev/2656641ea844
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 1036030 - Correctly substitute inline html for l10n string placeholders. r=ferjm

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https://hg.mozilla.org/integration/gaia-central/rev/229833afeca8
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #21828 from azasypkin/bug-1039585-event-dispatcher

Bug 1039585 - [Messages][Refactoring] Implement EventDispatcher object. r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/c9c14709861b
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1039585 - [Messages][Refactoring] Implement EventDispatcher object. r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/b49b551e3a75
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #21895 from justindarc/bug1028253

Bug 1028253 - Camera App memory regression in FxOS

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https://hg.mozilla.org/integration/gaia-central/rev/0cfbc278eb47
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1028253 - Camera App memory regression in FxOS
Bumping manifests a=b2g-bump