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

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https://hg.mozilla.org/integration/gaia-central/rev/6c593455e3d1
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #17786 from KevinGrandon/bug_989663_contacts_jshint

Bug 989663 - [Contacts] Jshint fixes for js/ r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/410ade2be66a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 989663 - [Contacts] Jshint fixes for js/ r=arcturus

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "10eb20cc1233bc12ead2f845b158060c9ed8f2df", 
+    "revision": "6c593455e3d1292120a6f3d41ec5d06bc91019f1", 
     "repo_path": "/integration/gaia-central"
 }