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

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https://hg.mozilla.org/integration/gaia-central/rev/f1f38950dbdf
Author: gitmai <mri@tid.es>
Desc: Merge pull request #15457 from gitmai/bug-960103-javascript-warning-views-fisttime_css

Bug 960103 - Javascript Warning. Error in parsing value for background. ...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/998b4d2764cb
Author: mai <mri@tid.es>
Desc: Bug 960103 - Javascript Warning. Error in parsing value for background. Declaration dropped. {file: firsttime.css

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "b6246e059f4fc5001ee426f84d38ce05c2aabc7e", 
+    "revision": "f1f38950dbdf93971dd1ca85d4186b48afd87dbe", 
     "repo_path": "/integration/gaia-central"
 }