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

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https://hg.mozilla.org/integration/gaia-central/rev/67dced59adbe
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #21920 from etiennesegonzac/bug-1037261-complete

Bug 1037261 - Soft home key should not span the bottom of screen in landscape r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/a953f444d1e7
Author: Markus Nilsson <markus.nilsson@sonymobile.com>
Desc: Bug 1037261 - Soft home key should not span the bottom of screen in landscape

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "2a438b8977aa8d0601a45ff617306740eb9f6727", 
+    "revision": "67dced59adbe49eade487e8611f08610a15513c7", 
     "repo_path": "/integration/gaia-central"
 }