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

========

https://hg.mozilla.org/integration/gaia-central/rev/85ca4afa5bff
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #13578 from evanxd/bug-932605

Bug 932605 - [calendar] caldav server for integration testing

========

https://hg.mozilla.org/integration/gaia-central/rev/d774b05ee22d
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 932605 - Add CalDAV server for integration testing. r=gaye

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "7201104392167db672dae542334446cc88304be3", 
+    "revision": "85ca4afa5bffeb02923e016a68f189408fae4c27", 
     "repo_path": "/integration/gaia-central"
 }