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

========

https://hg.mozilla.org/integration/gaia-central/rev/f1d7969e9fd8
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #12470 from jmcanterafonseca/email_fixed

Bug 918786 - Contacts App allows empty email addresses

========

https://hg.mozilla.org/integration/gaia-central/rev/973bc5021c4a
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 918786 - Contacts App allows empty email addresses

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "f4e805ae81c9b6055f135fbab5d0888fe966e509", 
+    "revision": "f1d7969e9fd8575714ae24c5eb24219644c51b97", 
     "repo_path": "/integration/gaia-central"
 }