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

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https://hg.mozilla.org/integration/gaia-central/rev/da85955beafd
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #18749 from EverythingMe/bug1002470

[Bug 1002470] Support for extra page on left [r=ranbena]

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https://hg.mozilla.org/integration/gaia-central/rev/1fea6cc32dc5
Author: Amir Nissim <amirnissim@gmail.com>
Desc: [Bug 1002470] Support for extra page on left [r=ranbena]

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "c6e7e185943df7e901ba72c7b9207dd45a263c14", 
+    "revision": "da85955beafd741190aabe426890b833419b9a93", 
     "repo_path": "/integration/gaia-central"
 }