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

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https://hg.mozilla.org/integration/gaia-central/rev/334588c8cd8a
Author: Jan Keromnes <janx@linux.com>
Desc: Merge pull request #18237 from jankeromnes/updatechannel

Bug 984962 - Expose app.update.{channel,url} in the Developer menu. r=21

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https://hg.mozilla.org/integration/gaia-central/rev/787fba14b1d5
Author: Jan Keromnes <janx@linux.com>
Desc: Bug 984962 - Expose app.update.{channel,url} in the Developer menu. r=21

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "8cb6303fe1f8597d8066a4b6f3504be9237dc290", 
+    "revision": "334588c8cd8a3e71306635e8663480ed6baf7d7d", 
     "repo_path": "/integration/gaia-central"
 }