Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/47acb5a1e76c
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #11863 from karlcow/ua-override-1.1

Bug 907161 - Remove UA override for domains week starting 2013-08-19

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https://hg.mozilla.org/integration/gaia-central/rev/ea8bd1454c0c
Author: karl <karl+github@la-grange.net>
Desc: Fixes for UA override for the 1.1 branch

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https://hg.mozilla.org/integration/gaia-central/rev/82eaed48989d
Author: karl <karl+github@la-grange.net>
Desc: Fixes for UA override for the 1.1 branch

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https://hg.mozilla.org/integration/gaia-central/rev/6fbbe2cbc2e6
Author: karl <karl+github@la-grange.net>
Desc: Remove UA override for badoo.com, booking.com, accounts.google.com, 4shared.com, edmunds.com, aprod.hu, profession.hu

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "9b943110e4c18abcc4eec57a312b6072924d2891", 
+    "revision": "47acb5a1e76c1ab58291dbb39840ecf2899f1f2f", 
     "repo_path": "/integration/gaia-central"
 }