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

========

https://hg.mozilla.org/integration/gaia-central/rev/4b075d3d4d4a
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #20813 from jrburke/bug1028055-email-reader-title

Bug 1028055 - Sender's email is not displayed In the details page of a received email r=mcav

========

https://hg.mozilla.org/integration/gaia-central/rev/45ce016d4805
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1028055 - Sender's email is not displayed In the details page of a received email

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "f6556c09eb6c0e2152de2f880a0d41245e8408c1", 
+    "revision": "4b075d3d4d4a509b2e6f3c4a2b7a8c7e2ff58b0f", 
     "repo_path": "/integration/gaia-central"
 }