Switch context back to being nsISupports, but make it clear that it's expected

to be an nsIDOMNode or nsIDOMWindow.  Bug 252027, r=mvl, sr=shaver


git-svn-id: svn://10.0.0.236/trunk@159916 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/docshell/base/nsDocShell.cpp

@@ -5124,10 +5124,14 @@ nsDocShell::InternalLoad(nsIURI * aURI,
         contentType = nsIContentPolicy::TYPE_DOCUMENT;
     }
 
+    nsISupports* context = requestingElement;
+    if (!context) {
+        context =  mScriptGlobal;
+    }
     rv = NS_CheckContentLoadPolicy(contentType,
                                    aURI,
                                    aReferrer,
-                                   requestingElement,
+                                   context,
                                    EmptyCString(), //mime guess
                                    nsnull,         //extra
                                    &shouldLoad);