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

========

https://hg.mozilla.org/integration/gaia-central/rev/216a751e109b
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #12962 from reubenmorais/more-webidl-fixes

Bug 928635 - Fix handling of array properties in the New Contact form.  r=wanderview

========

https://hg.mozilla.org/integration/gaia-central/rev/0f06b2e962b6
Author: Reuben Morais <reuben.morais@gmail.com>
Desc: Bug 928635 - Fix handling of array properties in the New Contact form. r=bkelly

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "2e42bc57d96cf4c130cbe608aa4eef417f0044f5", 
+    "revision": "216a751e109bd46700d41195c68985beee4ac2af", 
     "repo_path": "/integration/gaia-central"
 }