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

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https://hg.mozilla.org/integration/gaia-central/rev/dad0a9071115
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #20823 from yzen/bug-1019362

Bug 1019362 - adding a number of gaia ui tests for the first time use ap...

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https://hg.mozilla.org/integration/gaia-central/rev/ff5d9c34aaef
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1019362 - adding a number of gaia ui tests for the first time use app accessibility.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "2c66d42bf145a0f0d209daba36e3ff058ebf4917", 
+    "revision": "dad0a907111517270f1fc927db5b484e700688c7", 
     "repo_path": "/integration/gaia-central"
 }