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

========

https://hg.mozilla.org/integration/gaia-central/rev/c2ad1f367b62
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #16581 from gaye/kill-extra-copy-of-test-agent

Bug 976152 - Move test-agent off of npm r=lightsofapollo

========

https://hg.mozilla.org/integration/gaia-central/rev/3e6170bfc478
Author: Gareth Aye <gaye@mozilla.com>
Desc: Bug 976152 - Move test-agent off of npm r=lightsofapollo

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "78ec375c2b2df11693c84ed732a863d57245f3f1", 
+    "revision": "c2ad1f367b62d4eca293ef42e6dba3784014c9bc", 
     "repo_path": "/integration/gaia-central"
 }