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

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https://hg.mozilla.org/integration/gaia-central/rev/553d71d2b228
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #17082 from KevinGrandon/bug_982084_contacts_marionette_jshint

Bug 982084 - [Contacts] JSHint fixes for test/marionette/ r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/ff4a76c2663a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 982084 - [Contacts] JSHint fixes for test/marionette/ r=arcturus

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "branch": "", 
         "revision": ""
     }, 
-    "revision": "2fb823cf953da681501917ee3e13038f453d12db", 
+    "revision": "553d71d2b228f5c255c845e32d7a038fde18b77f", 
     "repo_path": "/integration/gaia-central"
 }