Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/e02270382cec
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #20158 from yzen/bug-1018214

Bug 1018214, Bug 1021710 - utility tray gaia-ui tests with some tweaks to hopefully avoid intermittents.

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https://hg.mozilla.org/integration/gaia-central/rev/7fcd4aca068d
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1021710 - updating accessibility.js to use standard marionette timeout instead of it's arbitrary one when retrieving an accessible object.

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https://hg.mozilla.org/integration/gaia-central/rev/0fd22d37c543
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1018214 - adding a number of gaia ui tests for status bar and utility tray accessibility. r=Bebe

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "300c3198dcd36de9cbf05bc9666e93ef9365d73d", 
+    "revision": "e02270382cec2f206d36b2c2ca0e027ca8b77240", 
     "repo_path": "/integration/gaia-central"
 }