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

========

https://hg.mozilla.org/integration/gaia-central/rev/818c13a8ae49
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #23248 from snowmantw/issue1057812

Bug 1057812 - Intermittent errors.JavascriptException: JavascriptExcepti...

========

https://hg.mozilla.org/integration/gaia-central/rev/3cee526aab70
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1057812 - Intermittent errors.JavascriptException: JavascriptException: TypeError: d is undefined

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "b408bfc1fdebac51eff030919b156d16e61ddde4", 
+    "revision": "818c13a8ae49562a3c20ba5d890a9c511d1ebd91", 
     "repo_path": "/integration/gaia-central"
 }