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

========

https://hg.mozilla.org/integration/gaia-central/rev/168c5ba3a072
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #21655 from pivanov/bug-1035708

Bug 1035708 - [Bluetooth] - remove unused images

========

https://hg.mozilla.org/integration/gaia-central/rev/6835a0ba204a
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1035708 - [Bluetooth] - remove unused images

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "52fddab5675c8d3a7387c9bed68a67e7ee59e52c", 
+    "revision": "168c5ba3a072b6c6b30bcc93586f833cc97fff4a", 
     "repo_path": "/integration/gaia-central"
 }