Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/3a4d74ada4a4
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #23845 from crdlc/bug-1062820

Bug 1062820 - Home screen and status bar behave different after clicking...

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https://hg.mozilla.org/integration/gaia-central/rev/11051c206c52
Author: crdlc <crdlc@tid.es>
Desc: Bug 1062820 - Home screen and status bar behave different after clicking home button among versions

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https://hg.mozilla.org/integration/gaia-central/rev/521a43a95cc8
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #22248 from mancas/bug981566

Bug 981566 - [settings] add marionette test for device information - You... r=gduan

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https://hg.mozilla.org/integration/gaia-central/rev/87321ffbbc74
Author: Manuel Casas Barrado <b.mcb@tid.es>
Desc: Bug 981566 - [settings] add marionette test for device information - Your Privacy

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "e6744166ac5e4f01999c5ce93c77afdbf8a12eee", 
+    "revision": "3a4d74ada4a492dbdedcb33eca31fc308eb5e736", 
     "repo_path": "/integration/gaia-central"
 }