mshtml: Don't change nsIWineURI in OnStartBinding if it's already marked as document URI.

dlls/mshtml/nsembed.c

@@ -1149,6 +1149,7 @@ static nsresult NSAPI nsURIContentListener_OnStartURIOpen(nsIURIContentListener
     nsIWineURI *wine_uri;
     nsACString spec_str;
     const char *spec;
+    BOOL is_doc_uri;
     nsresult nsres;
 
     nsACString_Init(&spec_str, NULL);
@@ -1165,6 +1166,9 @@ static nsresult NSAPI nsURIContentListener_OnStartURIOpen(nsIURIContentListener
         return NS_ERROR_NOT_IMPLEMENTED;
     }
 
+    nsIWineURI_GetIsDocumentURI(wine_uri, &is_doc_uri);
+
+    if(!is_doc_uri) {
         nsIWineURI_SetNSContainer(wine_uri, This);
         nsIWineURI_SetIsDocumentURI(wine_uri, TRUE);
 
@@ -1190,6 +1194,7 @@ static nsresult NSAPI nsURIContentListener_OnStartURIOpen(nsIURIContentListener
         }else if(This->doc) {
             *_retval = translate_url(This->doc->basedoc.doc_obj, wine_uri);
         }
+    }
 
     nsIWineURI_Release(wine_uri);