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

========

https://hg.mozilla.org/integration/gaia-central/rev/6eebea42f3f6
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #13123 from pivanov/bug-931555

Bug 931555 - [Bluetooth] - wrong button style on file transfer failed screen

========

https://hg.mozilla.org/integration/gaia-central/rev/55ca2e71c1af
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 931555 - [Bluetooth] - wrong button style on file transfer failed screen

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "31c586470ff25b5944a6543ae2ab851baa7372e4", 
+    "revision": "6eebea42f3f67c0a4ec4face73212e317a1813ca", 
     "repo_path": "/integration/gaia-central"
 }