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

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https://hg.mozilla.org/integration/gaia-central/rev/375197d3c3a9
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #20288 from dominickuo/bug-1015837

Bug 1015837 - [System] Sound toast visual refresh, r= alivedise

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https://hg.mozilla.org/integration/gaia-central/rev/82d3e3ff975b
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 1015837 - [System] Sound toast visual refresh

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "af732f0d636261d36ab5863a480d6fc2039e3080", 
+    "revision": "375197d3c3a996a4b7bf19b7104545f824b6560d", 
     "repo_path": "/integration/gaia-central"
 }