Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/e49e9f73982c
Author: Carsten Book -Tomcat- <cbook@mozilla.com>
Desc: Revert "Bug 991088 - Fix test_system_notification_bar.py" after being pinged in #gaia for travis red

This reverts commit 393dca9ca5fcf761a49b0dc58aeb59057b83992e.

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https://hg.mozilla.org/integration/gaia-central/rev/b3ea1e5a0870
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #17658 from julienw/929027-multiple-share

Bug 929027 - multiple share, r=schung

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https://hg.mozilla.org/integration/gaia-central/rev/bec3ca37e50d
Author: Julien Wajsberg <felash@gmail.com>
Desc: Follow-ups:

* change the string when there is several files
* remove useless Mock_alert
* indentation changes

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https://hg.mozilla.org/integration/gaia-central/rev/0ae233ffeb95
Author: Julien Wajsberg <felash@gmail.com>
Desc: Follow-up:

* do not show max size alert for images
* changed slightly the tests

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https://hg.mozilla.org/integration/gaia-central/rev/67580d7b252c
Author: sasikala.paruchuri <sasikala.paruchuri@lge.com>
Desc: Bug 929027 - [Messages] Multiple image sharing from Gallery to Messages r=schung

Updated review comments
Bumping manifests a=b2g-bump