Fix for bug 634865 (Non libxul build bustage: undefined reference to xpc_UnmarkGrayObjectRecursive). r+a=jst

modules/plugin/base/src/nsJSNPRuntime.cpp

@@ -56,7 +56,6 @@
 #include "nsIDOMElement.h"
 #include "prmem.h"
 #include "nsIContent.h"
-#include "xpcpublic.h"
 
 using namespace mozilla::plugins::parent;
 
@@ -2038,18 +2037,20 @@ nsJSNPRuntime::OnPluginDestroy(NPP npp)
     return;
   }
 
-  nsCOMPtr<nsINode> node(do_QueryInterface(element));
-
-  JSObject *obj;
-  if (!node || !(obj = node->GetWrapper())) {
+  nsCOMPtr<nsIXPConnectWrappedNative> holder;
+  xpc->GetWrappedNativeOfNativeObject(cx, sgo->GetGlobalJSObject(), content,
+                                      NS_GET_IID(nsISupports),
+                                      getter_AddRefs(holder));
+  if (!holder) {
     return;
   }
 
-  JSObject *proto;
+  JSObject *obj, *proto;
+  holder->GetJSObject(&obj);
 
   JSAutoEnterCompartment ac;
 
-  if (!ac.enter(cx, obj)) {
+  if (obj && !ac.enter(cx, obj)) {
     // Failure to enter compartment, nothing more we can do then.
     return;
   }