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

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https://hg.mozilla.org/integration/gaia-central/rev/6c176a59313a
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #13020 from gitmai/bug-923152-group-non-latin-names-import

Bug 923152 - Group non-latin names on import contacts

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https://hg.mozilla.org/integration/gaia-central/rev/3beab33c5d1e
Author: mai <mri@tid.es>
Desc: Bug 923152 - Group non-latin names on import contacts

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "0767056bc6c20188887c381f44dd4a0e8380380d", 
+    "revision": "6c176a59313a1e2087e3b8ce09d34d85334fc357", 
     "repo_path": "/integration/gaia-central"
 }