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

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https://hg.mozilla.org/integration/gaia-central/rev/cb66994a0ba3
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #19763 from steveck-chung/bug-1009098

Bug 1009098 - [Messages] The composer is displayed in the edit mode, r=azasypkin

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https://hg.mozilla.org/integration/gaia-central/rev/89007cdf166d
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 1009098 - [Messages] The composer is displayed in the edit mode

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "8dc29686ea313c5aa95bd1803d0c8b243d490ee9", 
+    "revision": "cb66994a0ba311042c59cb7363c0bad71d26f63f", 
     "repo_path": "/integration/gaia-central"
 }