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

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https://hg.mozilla.org/integration/gaia-central/rev/6a65311b8639
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #12767 from jmcanterafonseca/fix_924400

Bug 924400 - A no name contact imported from the SIM card does not allow...

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https://hg.mozilla.org/integration/gaia-central/rev/beec993f2ca6
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 924400 - A no name contact imported from the SIM card does not allow to find duplicates

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "1ee8dfe570fcb6856e778cc8257ecf5797c673d3", 
+    "revision": "6a65311b8639dba00bf76abb9db20b50d649cea6", 
     "repo_path": "/integration/gaia-central"
 }