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

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https://hg.mozilla.org/integration/gaia-central/rev/f120e79a6735
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #24958 from benfrancis/1075011

Bug 1075011 - Swap browser app for search app on old homescreen r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/d2492f566ca1
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 1075011 - Swap browser app for search app on old homescreen

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "bdc36dfa436939f83368c0d2976176b01a0d8049", 
+    "revision": "f120e79a6735573f98b7a121e350cf01bcd855d3", 
     "repo_path": "/integration/gaia-central"
 }