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

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https://hg.mozilla.org/integration/gaia-central/rev/4aee63f3cdf2
Author: Kevin Canévet <inscription@stymaar.fr>
Desc: Merge pull request #21040 from vingtetun/opaque.statusbar

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https://hg.mozilla.org/integration/gaia-central/rev/031e975a07e0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20996 from KevinGrandon/bug_1029040_collections_offline_experience

Bug 1029040 - [Collection app] Do not allow creation of collections while offline

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https://hg.mozilla.org/integration/gaia-central/rev/f738b6081de5
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1029040 - [Collection app] Do not allow creation of collections while offline

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https://hg.mozilla.org/integration/gaia-central/rev/b4b982432aab
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #21040 from vingtetun/opaque.statusbar"

This reverts commit 6d33e7207146e86586ed49434662b9c1899c0a79, reversing
changes made to 62a4c0ae611ff15b721e93fb579aad02c09b4aa5.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "ea734170c8114e10140da18960a4cb5ca1b54e0a", 
+    "revision": "4aee63f3cdf2a05dea6ea3a18182a4d4394bdfb0", 
     "repo_path": "/integration/gaia-central"
 }