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

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https://hg.mozilla.org/integration/gaia-central/rev/4f4cb495fc07
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1124146 - merge pull request #28218 from sfoster:task-manager-short-name-bug-1124146 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/f57b6de2ab7d
Author: Sam Foster <sfoster@mozilla.com>
Desc: Bug 1124146 - Use manifest short_name in task manager. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/478d7b4cd0f0
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1131486 - merge pull request #28225 from mikehenrty:bug-1131486-rtl-download-checkboxes to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/350e76762408
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1131486 - Use RTL compatible styles for the download list

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "b6ab33b486e28f5ca94ec593ae64b61c6d7a1f68", 
+        "git_revision": "6943356112f7103602f578e8436dbc7b7a60de67", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "1119b2f8a72c1c6244a398059d622811bb59548c", 
+    "revision": "4f4cb495fc0704c622b6cd27188a8356b6e42869", 
     "repo_path": "integration/gaia-central"
 }