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

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https://hg.mozilla.org/integration/gaia-central/rev/349a37c2b731
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #13462 from timdream/keyboard-callback-error

Bug 935868 - check for callback(), r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/e0e271c8ae98
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 935868 - check for callback()

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "6360408c567f53c09d595817788718b8b512e630", 
+    "revision": "349a37c2b731eb693d80406976217d42322108af", 
     "repo_path": "/integration/gaia-central"
 }