Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/ba989feb2a38
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #10481 from crh0716/882095

Bug 882095 - Restart the connection only when APN related settings changed

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https://hg.mozilla.org/integration/gaia-central/rev/c3bdda6736a0
Author: crh0716 <crh0716@gmail.com>
Desc: Bug 882095 - Restart the connection only when APN related settings changed

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "15b25eafc10d65cc742d3a50b0bf59e924bc3c30", 
+    "revision": "ba989feb2a384f36c0545697984d44f3cf19770f", 
     "repo_path": "/integration/gaia-central"
 }