Bumping gaia.json for 1 gaia-central revision(s)

========

https://hg.mozilla.org/integration/gaia-central/rev/bb61eb10b387
Author: Rick Waldron <waldron.rick@gmail.com>
Desc: Bug 909644 - Re-enable SMS UI Thread Test (fails on CI) [Will assimilate recipients]

https://bugzilla.mozilla.org/show_bug.cgi?id=909644

- Remove obsolete tests

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "9aaf903e349757a1e0b89daecf5c1ac527e9a1a5", 
+    "revision": "bb61eb10b38726305bc033cc23e1024b489dc8c8", 
     "repo_path": "/integration/gaia-central"
 }