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

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https://hg.mozilla.org/integration/gaia-central/rev/33a3a3796882
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #12414 from alivedise/bugzilla/905116_master_v7

Bug 905116 - Implement Homescreen Window + Homescreen Launcher, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/e1e47585c181
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 905116 - Implement Homescreen Window + Homescreen Launcher

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "e158e50fd7abdbd4af987a6e42dd5d3a5f5a707d", 
+    "revision": "33a3a3796882ba433dafa7098efd31cf36e16405", 
     "repo_path": "/integration/gaia-central"
 }