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

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https://hg.mozilla.org/integration/gaia-central/rev/84a3ccb6f415
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #17423 from timdream/keyboard-mempressure-race-master

Bug 984238 - Don't kill the keyboard when when it's being launched +shepherd

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https://hg.mozilla.org/integration/gaia-central/rev/ebd5fc74f4a1
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 984238 - Don't kill the keyboard when when it's being launched

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "branch": "", 
         "revision": ""
     }, 
-    "revision": "3bb28013057ebd86072df891a0af68fae540743f", 
+    "revision": "84a3ccb6f415dbe314035671bb911c039e04281f", 
     "repo_path": "/integration/gaia-central"
 }