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

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https://hg.mozilla.org/integration/gaia-central/rev/af5c9c6b6bf9
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #23606 from RudyLu/keyboard/backout_tests_Bug1053647

Revert "Merge pull request #23343 from RudyLu/keyboard/Bug1053647"

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https://hg.mozilla.org/integration/gaia-central/rev/13a92e91f9e6
Author: Rudy Lu <me@rudy.lu>
Desc: Revert "Merge pull request #23343 from RudyLu/keyboard/Bug1053647"

This reverts commit 39cad6c82122b964f12a66771bfbcc14fb342d9e, reversing
changes made to bc9a482a98e16f011c82f40e3c42bababb159bf1.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "c448b6769528224553863f701e9b572441b3b72b", 
+    "revision": "af5c9c6b6bf97967a2cdaf2c6807a668fd894597", 
     "repo_path": "/integration/gaia-central"
 }