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

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https://hg.mozilla.org/integration/gaia-central/rev/4bf5b539097e
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #25470 from eeejay/bug-1088053

Bug 1088053 - Lockscreen input window state should initially have aria-h... r=snowmantw

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https://hg.mozilla.org/integration/gaia-central/rev/ed6a9182056b
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1088053 - Lockscreen input window state should initially have aria-hidden=true

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "959cdae008fd4b62d81c46a816d112a95c6230d0", 
+    "revision": "4bf5b539097e7e72267a800671b553b751735483", 
     "repo_path": "/integration/gaia-central"
 }