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

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https://hg.mozilla.org/integration/gaia-central/rev/84f413a40a6c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19390 from crdlc/bug-1012692

Bug 1012692 - (vertical-homescreen) Add option to change the wallpaper

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https://hg.mozilla.org/integration/gaia-central/rev/f65c2bee6705
Author: crdlc <crdlc@tid.es>
Desc: Bug 1012692 - (vertical-homescreen) Add option to change the wallpaper

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "5b3c57323fdc549e165278a0e2eaace50dfe5604", 
+    "revision": "84f413a40a6c044e3bea359b44fe2b3952180aa3", 
     "repo_path": "/integration/gaia-central"
 }