Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6b4f6119f0e3
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #25443 from jmcanterafonseca/fix_logout_window_open

Bug 1084224 - [Midori 2.0][Contacts][Facebook]keep logging out interface...

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https://hg.mozilla.org/integration/gaia-central/rev/83a330c8b18d
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1084224 - [Midori 2.0][Contacts][Facebook]keep logging out interface always when clickX

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https://hg.mozilla.org/integration/gaia-central/rev/f89668f9c96b
Author: chirarobert <robert.chira@softvision.ro>
Desc: Merge pull request #25376 from JohanLorenzo/bug-1086603

Bug 1086603 - Add test test_browser_navigation.py to share a link to the...

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https://hg.mozilla.org/integration/gaia-central/rev/ebb0d5d6a537
Author: Johan Lorenzo <jlorenzo@mozilla.com>
Desc: Fixes from chirarobert review

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https://hg.mozilla.org/integration/gaia-central/rev/b0a9464d21fa
Author: Johan Lorenzo <jlorenzo@mozilla.com>
Desc: Bug 1086603 - Add test test_browser_navigation.py to share a link to the SMS app

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "7dde13e3c0740ffb13519ab40fa80e4c0625d754", 
+    "revision": "6b4f6119f0e3816af1db5b27a3fa76f8278f77f4", 
     "repo_path": "/integration/gaia-central"
 }