Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/1accc4295bbc
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #20168 from justindarc/bug1015412

Bug 1015412 - [FMRadio] Implement new startup loading events

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https://hg.mozilla.org/integration/gaia-central/rev/1d74b74b765b
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1015412 - [FMRadio] Implement new startup loading events

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https://hg.mozilla.org/integration/gaia-central/rev/2216b9439ef8
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #20414 from EverythingMe/1024330-ctx

Bug 1024330 - [Everything.me] Device context for Partners API

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https://hg.mozilla.org/integration/gaia-central/rev/e584fae04ae6
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 1024330 - [Everything.me] Device context for Partners API:
 * send ctx param to API
 * device.js simpler with getters
 * observe window.languagechange and use navigator.language instead of settings["language.current"]
Bumping manifests a=b2g-bump