Bug 1213407 - PluginModuleContentParent should delete its Transport. r=billm

dom/plugins/ipc/PluginModuleParent.cpp

@@ -690,6 +690,9 @@ PluginModuleContentParent::PluginModuleContentParent(bool aAllowAsyncInit)
 
 PluginModuleContentParent::~PluginModuleContentParent()
 {
+    XRE_GetIOMessageLoop()->PostTask(FROM_HERE,
+                                     new DeleteTask<Transport>(GetTransport()));
+
     Preferences::UnregisterCallback(TimeoutChanged, kContentTimeoutPref, this);
 }