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

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https://hg.mozilla.org/integration/gaia-central/rev/d2dbb99dd87c
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #13498 from timdream/keyboard-preload

Bug 936349 - Correct keyboard manager start-up, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/72e5af4570b1
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 936349 - Correct keyboard manager start-up

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "59dfb682808c843082fef49fbfd98a5b0b599000", 
+    "revision": "d2dbb99dd87cf0ce355ff7f4bb5492247eb9ec06", 
     "repo_path": "/integration/gaia-central"
 }