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

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https://hg.mozilla.org/integration/gaia-central/rev/4122e54a676b
Author: Florin Strugariu <florin.strugariu@softvision.ro>
Desc: Merge pull request #26578 from davehunt/bug1074117-messages

Bug 1074117 - Use expected conditions and optimise element lookups in messages app object

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https://hg.mozilla.org/integration/gaia-central/rev/e9813ed3320e
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 1074117 - Use expected conditions and optimise element lookups in messages app object. r=fstrugariu

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "59ce7d140cec45750edba98d708e85e5a8de4a6d", 
+    "revision": "4122e54a676b32a5172a079572a37eb950b7e486", 
     "repo_path": "integration/gaia-central"
 }