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

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https://hg.mozilla.org/integration/gaia-central/rev/bf3a67026235
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #13959 from KevinGrandon/bug_942214_system_throws_error

Bug 942214 - [System] remove a few errors being logged r=alive

========

https://hg.mozilla.org/integration/gaia-central/rev/1286baee4749
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 942214 - [System] remove a few errors being logged

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "3672de9c994b4a06d8f12f64b848a9896dcb2ac2", 
+    "revision": "bf3a67026235f2556ba2bdf2a1f4a7ac22507db6", 
     "repo_path": "/integration/gaia-central"
 }