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

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https://hg.mozilla.org/integration/gaia-central/rev/56377deff110
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #30639 from hfiguiere/bug1170653-tabbar-tests

Bug 1170653 - Tab bar unit test. r=dkuo

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https://hg.mozilla.org/integration/gaia-central/rev/946a8369fd97
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 1170653 - Tab bar unit test.

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "aea20df8adae52f706f0e1a6ecf650b1d8847a79", 
+        "git_revision": "cd6efddb586e62997912b12de6f1ccfe8e13fa28", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "b8659aa4c69d294f6ab9ca0a08d80cdac7506877", 
+    "revision": "56377deff110b1e54f85dc0b27660f8c2f5056ff", 
     "repo_path": "integration/gaia-central"
 }