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

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https://hg.mozilla.org/integration/gaia-central/rev/3b27c1a147b8
Author: Yi-Fan Liao <yliao@mozilla.com>
Desc: Merge pull request #23415 from begeeben/1007816_bookmark_a_link

Bug 1007816 - add ability to bookmark a link, r=:benfrancis

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https://hg.mozilla.org/integration/gaia-central/rev/516f30b048ee
Author: Yi-Fan Liao <begeeben@gmail.com>
Desc: Bug 1007816 - add ability to bookmark a link

* Add bookmark link to homescreen button in contextmenu

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https://hg.mozilla.org/integration/gaia-central/rev/00012eb251e0
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #23888 from evanxd/bug-1064305

Bug 1064305 - Disable the tests

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https://hg.mozilla.org/integration/gaia-central/rev/d14f5c579f11
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 1064305 - Disable the tests

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "6339f53919ea4448a413ffe02f593312dfd21978", 
+    "revision": "3b27c1a147b809245e2426cd07e4d2822fca4c42", 
     "repo_path": "/integration/gaia-central"
 }