Bug 1566369 - Lower the audioipc thread pool thread count to 1 on Linux. r=kinetik

Differential Revision: https://phabricator.services.mozilla.com/D38170

--HG--
extra : moz-landing-system : lando

modules/libpref/init/all.js

@@ -465,7 +465,7 @@ pref("media.cubeb.logging_level", "");
 // Cubeb sandbox (remoting) control
 #if defined(XP_LINUX) && !defined(MOZ_WIDGET_ANDROID)
 pref("media.cubeb.sandbox", true);
-pref("media.audioipc.pool_size", 2);
+pref("media.audioipc.pool_size", 1);
 // 64 * 4 kB stack per pool thread.
 pref("media.audioipc.stack_size", 262144);
 #else