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

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https://hg.mozilla.org/integration/gaia-central/rev/854db39fc09e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22277 from KevinGrandon/bug_1045758_combine_rocketbars

Bug 1045758 - [Rocketbar] Haida cleanup and home search rollup

========

https://hg.mozilla.org/integration/gaia-central/rev/6c14238e51bf
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1045758 - [Rocketbar] Haida cleanup and home search rollup r=vingtetun

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "f78fb9a096c7023aef88daf12636333021cf534c", 
+    "revision": "854db39fc09e32b14590c571336a6cbe4c348f9c", 
     "repo_path": "/integration/gaia-central"
 }