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

========

https://hg.mozilla.org/integration/gaia-central/rev/8e0bdad94977
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #19219 from etiennesegonzac/bug-1009950-edge-gestures-on

Bug 1009950 - Turning the app-to-app edge gesture on by default. r=gwagner,21

========

https://hg.mozilla.org/integration/gaia-central/rev/d6f5bca247f6
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1009950 - Turning the app-to-app edge gesture on by default.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "76375434f4d15bb4f07f25b6ad1ef3e191e823d6", 
+    "revision": "8e0bdad9497750874718cd4971d9c2cca99f84d7", 
     "repo_path": "/integration/gaia-central"
 }