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

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https://hg.mozilla.org/integration/gaia-central/rev/f894ddb1493c
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #31715 from scottwu/1199872-audio-turning-sound-off-2

Bug 1199872 - Does not play sound until volumn change occured r=gasolin

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https://hg.mozilla.org/integration/gaia-central/rev/b6627aa9bdf9
Author: Scott Wu <scottcwwu@gmail.com>
Desc: Bug 1199872 - Does not play sound until volumn change occured r=gasolin

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "7e9315183b91fe549a75750d784b1fecafe426c2", 
+        "git_revision": "f37e8f732e0af961b43e912629c84c9e2ceda55d", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "b19c7256a967df90c8f79ad78917f13da360d4a7", 
+    "revision": "f894ddb1493cd8cdd3d3f807d784bce313e3eb9f", 
     "repo_path": "integration/gaia-central"
 }