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

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https://hg.mozilla.org/integration/gaia-central/rev/f99184595c66
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #22735 from julienw/1051852-use-domcontentloaded

Bug 1051852 - [Messages] use 'DOMContentLoaded' instead of 'load' to ini...

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https://hg.mozilla.org/integration/gaia-central/rev/9236a7ad9a6c
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1051852 - [Messages] use 'DOMContentLoaded' instead of 'load' to init the various resources r=schung

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "34308e903e51d4a9d1f9924e39948412ecce4761", 
+    "revision": "f99184595c66043518af436b6b09bf02c4d0cd4f", 
     "repo_path": "/integration/gaia-central"
 }