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

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https://hg.mozilla.org/integration/gaia-central/rev/3fe4d06741f2
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #18937 from AshayNeema/Bug_993887_System_Banner_wont_disapper_issue

Bug_993887 System Banner wont disapper issue

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https://hg.mozilla.org/integration/gaia-central/rev/118815c76a7a
Author: ashay.neema <ashay.neema@lge.com>
Desc: Bug_993887 System Banner wont disapper issue

Bug_993887 Fix TestCase

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https://hg.mozilla.org/integration/gaia-central/rev/2ee9ddc6112b
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #19384 from lhadji/1007568/copy-symlink

Bug 1007568 - Follow symlinks when copying apps into STAGE_DIR, r=yurenj...

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https://hg.mozilla.org/integration/gaia-central/rev/aa56a9402963
Author: Leila Hadji <leila.hadji@sonymobile.com>
Desc: Bug 1007568 - Follow symlinks when copying apps into STAGE_DIR, r=yurenju

Directories under GAIA_APPDIRS might contain symlinks
(e.g. outoftree_apps). When copying the symlinked apps
into STAGE_DIR without -L option, clear-stage-app
will remove the files in the target directory.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "bcb41edc0aac40392c07dc223fc45403b2dfb246", 
+    "revision": "3fe4d06741f28d33dbf52dea1fa4ade43b1c6953", 
     "repo_path": "/integration/gaia-central"
 }