Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/87505dbb861f
Author: Ed Morley <emorley@mozilla.com>
Desc: Revert "Bug 1047645 - Use manual timeout to guard _closed event from not firing r=alive" for JS exceptions

This reverts commit e13cc05b6d615664d769e55b60754480848d076b.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "7e70d8cbb8b0016c6007e45f6b37491136ffcd30", 
+    "revision": "87505dbb861f8c1e5437bcf92cc5a0040e6fdf3f", 
     "repo_path": "/integration/gaia-central"
 }