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

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https://hg.mozilla.org/integration/gaia-central/rev/b0b312ec5126
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #10424 from alivedise/bugzilla/883734/lint

Bug 883734 - fix lint error in sound manager, r=me

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https://hg.mozilla.org/integration/gaia-central/rev/4b11a437322c
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 883734 - fix lint error cause travis red

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "3f096cb9a6ebc62d8b29770d1687b8191f31298d", 
+    "revision": "b0b312ec5126906aa27a116cadb7733c63b8d869", 
     "repo_path": "/integration/gaia-central"
 }