Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/494467b3c443
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #11434 from etiennesegonzac/oncall-split-and-test

Bug 902983 - Split oncall.js and make it testable r=Rik

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https://hg.mozilla.org/integration/gaia-central/rev/c5e1f2148a89
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 902983 - Split oncall.js and make it testable
r=Rik

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "4013a01e6d3276dd7f41a0a177acc725352e5a78", 
+    "revision": "494467b3c4432964a8c1ba3739e20af65b248d88", 
     "repo_path": "/integration/gaia-central"
 }