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

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https://hg.mozilla.org/integration/gaia-central/rev/d4882fd16ad4
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #14483 from julienw/932793-intermittent-scroll-tests

Bug 932793 - Intermittent test "thread_ui.js > scrolling scroll 100px, s...

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https://hg.mozilla.org/integration/gaia-central/rev/d1cd825b9012
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 932793 - Intermittent test "thread_ui.js > scrolling scroll 100px, should be detected as a manual scroll" r=schung

* Fix intermittent scripts by sending the scroll event in the test
* Fix bad tests that were revealed in the process: `done` callback set on the
  suite function instead of the test function, wrong SMS messages.
* Linearized and de-asynchronized some tests

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https://hg.mozilla.org/integration/gaia-central/rev/1725c3613f3a
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #14507 from gtorodelvalle/contacts-bug-942010-self-duplicate

Bug 942010 - The test_add_photo_to_contact.py gets Duplicates Found screen

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https://hg.mozilla.org/integration/gaia-central/rev/c3d1280eda08
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 942010 - The test_add_photo_to_contact.py gets Duplicates Found screen