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

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https://hg.mozilla.org/integration/gaia-central/rev/f98ec5e292df
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #11573 from alivedise/bugzilla/905112/wrapper-factory

Bug 905112 - Implement Wrapper Factory, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/addfec2a2ec2
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 905112 - Wrapper Factory

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "febb15805a42be354a2e85572c8469109513d7f6", 
+    "revision": "f98ec5e292dffd144f0a6520cc18ff5cb7762d09", 
     "repo_path": "/integration/gaia-central"
 }