Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/10a9cab9cf34
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Merge pull request #11540 from gregorwagner/lockscreen

Bug 903563 - JavaScript errors evt.target.dataset is undefined

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https://hg.mozilla.org/integration/gaia-central/rev/86a4b98299e9
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Bug 903563 - JavaScript errors evt.target.dataset is undefined

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "7fc6b301a39cf78e3049f15bf13c2817155e3e3c", 
+    "revision": "10a9cab9cf34cc34b34e1ee2c83ba2bf0af6d6f1", 
     "repo_path": "/integration/gaia-central"
 }