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

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https://hg.mozilla.org/integration/gaia-central/rev/67b48b77c214
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #22854 from dholbert/1050431-remove-lines

Bug 1050431: Remove unnecessary 'flex' decls from video.css (equivalent to default values). r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/de8e87e3fe75
Author: Daniel Holbert <dholbert@cs.stanford.edu>
Desc: Bug 1050431: Remove unnecessary 'flex' decls from video.css (equivalent to default values). r=djf

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "c54aa442e0e0faf285bcb57d98180ba1514efd24", 
+    "revision": "67b48b77c2148286bcba5da4081694a1eab08ee1", 
     "repo_path": "/integration/gaia-central"
 }