Bumping gaia.json for 8 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/86636c1797f4
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #11941 from jmcanterafonseca/bug-912554

Bug 912554 - [Contacts] Preserve givenName and familyName of the new or ...

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https://hg.mozilla.org/integration/gaia-central/rev/ac397c5e0f7c
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 912554 - [Contacts] Preserve givenName and familyName of the new or being edited contact when merging.

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https://hg.mozilla.org/integration/gaia-central/rev/1d145503388b
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #11921 from jmcanterafonseca/bug-906756

Bug 906756 - Algorithms for merging givenName and familyName. Master Con...

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https://hg.mozilla.org/integration/gaia-central/rev/2948f46fcda1
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 906756 - Algorithms for merging givenName and familyName. Master Contact takes precedence

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https://hg.mozilla.org/integration/gaia-central/rev/5d876cf397fa
Author: Michael Vines <mvines@codeaurora.org>
Desc: Bug 911357 - Enable build-time overriding of default Gaia wallpaper via GAIA_DISTRIBUTION_DIR. r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/b2867a27e8ba
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #11849 from wanderview/shared-zero-timeout

Bug 910876:  Import NobleJS setImmediate polyfill - r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/b86f7a2a0aa6
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 910876: Customize NobleJS setImmediate polyfill

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https://hg.mozilla.org/integration/gaia-central/rev/4887ebab34ab
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 910876: Import NobleJS setImmediate() polyfill
Bug 912840 - Preload the appcache manifest properly in OfflineCacheInstaller.jsm r=ochameau