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

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https://hg.mozilla.org/integration/gaia-central/rev/916fa42b75d2
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #12761 from es92/music2-dbloading-improvements

Bug 924988: Improvements to Music2 DB Loading r=davidflanagan

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https://hg.mozilla.org/integration/gaia-central/rev/7a6c410fd2a7
Author: Evan Shapiro <evan.a.shapiro@gmail.com>
Desc: Bug 924988: Improvements to Music2 DB Loading

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "1a1827fe8389d074d764bf843951ae89b5e5e109", 
+    "revision": "916fa42b75d23393752647ef2b44da15e2e1dd52", 
     "repo_path": "/integration/gaia-central"
 }