Bug 608544 - Don't console-spam a totally expected warning about not getting the pref plugins.unloadASAP which has no default value, r+a=josh

modules/plugin/base/src/nsPluginHost.cpp

@@ -315,7 +315,6 @@ static PRBool UnloadPluginsASAP()
     }
   }
 
-  NS_WARNING("Unable to retrieve pref: plugins.unloadASAP");
   return PR_FALSE;
 }