Bug 293987 Mozilla cannot open PDF document via proxy and It crash after close the tab when it loaded.

Patch by leon.sha@sun.com
darin: review+
shaver: superreview+

modules/plugin/base/src/ns4xPluginInstance.cpp

@@ -1138,6 +1138,7 @@ NS_IMETHODIMP ns4xPluginInstance::SetWindow(nsPluginWindow* window)
   }
 
   // Allocate and fill out the ws_info data
+  if (!window->ws_info || !mXtBin) {
     if (!window->ws_info) {
 #ifdef NS_DEBUG
       printf("About to create new ws_info...\n");
@@ -1148,6 +1149,7 @@ NS_IMETHODIMP ns4xPluginInstance::SetWindow(nsPluginWindow* window)
 
       if (!window->ws_info)
         return NS_ERROR_OUT_OF_MEMORY;
+    }
 
     ws = (NPSetWindowCallbackStruct *)window->ws_info;
 

modules/plugin/base/src/nsPluginHostImpl.cpp

@@ -6740,6 +6740,15 @@ nsresult nsPluginStreamListenerPeer::ServeStreamAsFile(nsIRequest *request,
     if (owner) {
       nsPluginWindow    *window = nsnull;
       owner->GetWindow(window);
+#if defined (MOZ_WIDGET_GTK) || defined (MOZ_WIDGET_GTK2)
+      // Should call GetPluginPort() here.
+      // This part is copied from nsPluginInstanceOwner::GetPluginPort(). 
+      nsCOMPtr<nsIWidget> widget;
+      ((nsPluginNativeWindow*)window)->GetPluginWidget(getter_AddRefs(widget));
+      if (widget) {
+        window->window = (nsPluginPort*) widget->GetNativeData(NS_NATIVE_PLUGIN_PORT);
+      }
+#endif
       if (window->window)
       {
         nsCOMPtr<nsIPluginInstance> inst = mInstance;