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

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https://hg.mozilla.org/integration/gaia-central/rev/a3afe08d57c0
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #25288 from snowmantw/bug1084530

 Bug 1084530 - [Lockscreen] The device can fall asleep too quickly after...

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https://hg.mozilla.org/integration/gaia-central/rev/915fe67c6a93
Author: Greg Weng <snowmantw@gmail.com>
Desc:  Bug 1084530 - [Lockscreen] The device can fall asleep too quickly after dialing the last digit to an emergency number

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "fae12350d78c7ab12ad56f9dc468c1be2582e217", 
+    "revision": "a3afe08d57c0e4aa54f2501ed04096a159f0ee26", 
     "repo_path": "/integration/gaia-central"
 }