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

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https://hg.mozilla.org/integration/gaia-central/rev/3f373212c1e4
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #12174 from jrburke/bug892523-email-from-notification

Bug 892523 - [User Story] Email Invocation from Notification r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/02df7966719a
Author: jrburke <jrburke@gmail.com>
Desc: Bug 892523 - [User Story] Email Invocation from Notification

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "e7b4b6ba9e2786df88be8755e2e97702bed193b2", 
+    "revision": "3f373212c1e4ccf1ae3b285762b479baab9f6249", 
     "repo_path": "/integration/gaia-central"
 }