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

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https://hg.mozilla.org/integration/gaia-central/rev/4988a710019c
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #20375 from yzen/bug-1023995

Bug 1023995 - fixing visibility issues around e.me.

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https://hg.mozilla.org/integration/gaia-central/rev/72212ada7ded
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1023995 - fixing visibility issues around e.me. r=ran

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "0fef5c40f8fe66867b1b3819c08e3d00ffab47e7", 
+    "revision": "4988a710019ce1a89a38888f53730a0aa51a9be8", 
     "repo_path": "/integration/gaia-central"
 }