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

========

https://hg.mozilla.org/integration/gaia-central/rev/0b28cbe12ec7
Author: Yoshi Huang <allstars.chh@mozilla.com>
Desc: Merge pull request #19006 from svic/Bug_961687

Bug 961687: ShrinkingUI not sending URL. r=alive

========

https://hg.mozilla.org/integration/gaia-central/rev/f3e57e858835
Author: Garner Lee <garner.lee@telekom.com>
Desc: Bug 961687: ShrinkingUI not sending URL. Fix mismatched 'transitionend' animation listener callbacks. r=gweng

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "373670f1fc7e3a6612b516e68133f75072b1a6ef", 
+    "revision": "0b28cbe12ec78786664f17f05bc71a5260c36098", 
     "repo_path": "/integration/gaia-central"
 }