Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/df21bfde1bdd
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1122099 - merge pull request #28347 from hfiguiere:bug1122099-shuffle-playlist to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/30c3f6268080
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 1122099 - Test shuffle playlist.

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "0d639881706892399f33b2a03ba5f525662bcec4", 
+        "git_revision": "11735af250e86f869fb0e45fdb83ae51ea359c40", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "3aa66ec3728da478cdb385990883037dca7601eb", 
+    "revision": "df21bfde1bdda10cf76b8c30a3059a8de2bd80a6", 
     "repo_path": "integration/gaia-central"
 }