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

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https://hg.mozilla.org/integration/gaia-central/rev/8c37833f4969
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #12814 from pivanov/bug-845110

Bug 845110 - Calendar - Create Event Screen Updates r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/9bb40d427bf3
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 845110 - Calendar - Create Event Screen Updates

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "0af41c1c297f1b784fb103e6150910f334036f20", 
+    "revision": "8c37833f4969a882ebca34ca600e0b779773aa77", 
     "repo_path": "/integration/gaia-central"
 }