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

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https://hg.mozilla.org/integration/gaia-central/rev/63cd3e73851f
Author: Jim Porter <jporter@mozilla.com>
Desc: Merge pull request #16611 from dominickuo/bug-973156-new

Bug 973156 - [Music] Send mozinterruptbegin and mozinterruptend to media playback widget for displaying the correct play status; r=squib

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https://hg.mozilla.org/integration/gaia-central/rev/f83630786a85
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 973156 - [Music] Send mozinterruptbegin and mozinterruptend to media playback widget for displaying the correct play status

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https://hg.mozilla.org/integration/gaia-central/rev/9129bdbcc956
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #16534 from jrburke/bug953277-email-folder-list-twice

Bug 953277 - Tap 'inbox' with Google Mail account causes all of the emails to be listed twice r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/363a4a5c3c8a
Author: jrburke <jrburke@gmail.com>
Desc: Bug 953277 - Tap 'inbox' with Google Mail account causes all of the emails to be listed twice
Bumping manifests a=b2g-bump