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

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https://hg.mozilla.org/integration/gaia-central/rev/985cb08fd58b
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #18191 from DouglasSherk/994865-sms-stickyheader

Bug 994865 - [SMS] Move sticky refresh call from updateThread to appendThread if creating a new container. r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/4b12910992a9
Author: DouglasSherk <github@sherk.me>
Desc: Bug 994865 - [SMS] Make appendThread return whether or not it created a new container, and only sticky.refresh if it did. r=julienw

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "a28fade8377146d83bbbb800e066d551c542e233", 
+    "revision": "985cb08fd58b8401eaec8e13c8247b38d1468438", 
     "repo_path": "/integration/gaia-central"
 }