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

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https://hg.mozilla.org/integration/gaia-central/rev/39b3abef5580
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18009 from evanxd/bug-984572

Bug 984572 - JSHint fixes for js/*, js/utils and js/worker.

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https://hg.mozilla.org/integration/gaia-central/rev/3bc81bb7fb3b
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 984572 - JSHint fixes for js/*, js/utils and js/worker.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "bca31cd48f12b71b91f232997764ebc9136d64e9", 
+    "revision": "39b3abef5580391c362f0b2155bba7bc140cf04c", 
     "repo_path": "/integration/gaia-central"
 }