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

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https://hg.mozilla.org/integration/gaia-central/rev/869fab213dee
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1152002 - merge pull request #29381 from julienw:1152002-disable-e10s to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/f1c125a41012
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1152002 - Disable e10s in Gaia DEBUG profile -- again r=ricky

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "820bc8fe46ce346aa38a1bb0f147bbec8d16377f", 
+        "git_revision": "4aeaae4b3cc08709544685e13a7e80a6cda409df", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "e0974846c772a3bd0b05647053813772ae73abbf", 
+    "revision": "869fab213deefa9f40f96cb826f71b4740875742", 
     "repo_path": "integration/gaia-central"
 }