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

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https://hg.mozilla.org/integration/gaia-central/rev/619fa836a468
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #18941 from jmcanterafonseca/move_redirects2

Bug 1003774 - [FTU-Separation] Move local oauth redirect files

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https://hg.mozilla.org/integration/gaia-central/rev/cedae9b97433
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1003774 - [FTU-Separation] Move local oauth redirect files

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "cb2d1314690a839c45954522ba93e5e9ca5a7fa6", 
+    "revision": "619fa836a468eb5221aaad4ea091f7fd8ea736be", 
     "repo_path": "/integration/gaia-central"
 }