Bumping gaia.json for 9 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/573f0dc2a5aa
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #18567 from Archaeopteryx/settings-a11y-l10n-bug999946

Bug 999946 - Some Accessibility settings are not localized. r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/836ed625069e
Author: Sebastian Hengst <archaeopteryx@coole-files.de>
Desc: Bug 999946 - Some Accessibility settings are not localized

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https://hg.mozilla.org/integration/gaia-central/rev/b867b6bb539c
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #18577 from etiennesegonzac/bug-999478-on-demand-callscreen

Bug 999478 - Free the preloaded callscreen under memory pressure

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https://hg.mozilla.org/integration/gaia-central/rev/041c5c098319
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 999478 - Free the preloaded callscreen under memory pressure

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https://hg.mozilla.org/integration/gaia-central/rev/e9e009edd400
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #18371 from benfrancis/993346

Bug 993346 Show/hide Rocketbar by scrolling r=alive r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/60f1a9cf5f03
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 993346 - Expand/collapse Rocketbar by scrolling

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https://hg.mozilla.org/integration/gaia-central/rev/d2a72d0881f1
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #18504 from guilherme-pg/bug997309

Bug 997309 - Don't unset 'findmydevice.enabled' in the settings when already logged in

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https://hg.mozilla.org/integration/gaia-central/rev/11526acea051
Author: Guilherme Goncalves <guilherme.p.gonc@gmail.com>
Desc: Bug 997309 - Add some tests for the Settings panel of Find My Device.

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https://hg.mozilla.org/integration/gaia-central/rev/486e6ab5f934
Author: Guilherme Goncalves <guilherme.p.gonc@gmail.com>
Desc: Bug 997309 - Properly handle an already logged in user in Find My Device.
Bumping manifests a=b2g-bump