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

========

https://hg.mozilla.org/integration/gaia-central/rev/4439e4904cd4
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #19486 from hfiguiere/bug837669

Bug 837669 - Part 2: ignore negative timing for event that appear before our "start". r=eli

========

https://hg.mozilla.org/integration/gaia-central/rev/53159d3f6bc7
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 837669 - Part 2: ignore negative timing for event that appear before our "start".

========

https://hg.mozilla.org/integration/gaia-central/rev/aecd5959facd
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #19501 from davidflanagan/revert-bug-1000701

Revert "Merge pull request #19278 from ranjithgithub/1000701_FileNameDon...

========

https://hg.mozilla.org/integration/gaia-central/rev/0ee90e802bd2
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Revert "Merge pull request #19278 from ranjithgithub/1000701_FileNameDoneIconSupport"

This reverts commit 696257a7a60e0d87c25e23611f2a6aaf9a3cb86b, reversing
changes made to 10e4bc8a1760bfb66d1e63c881ce4b7f0d1b9755.
Bumping manifests a=b2g-bump