Fix build bustage

content/base/src/nsDocument.cpp

@@ -1062,7 +1062,7 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsDocument)
   // Tear down linkmap. This is a performance optimization so that we
   // don't waste time removing links one by one as they are removed
   // from the doc.
-  DestroyLinkMap();
+  tmp->DestroyLinkMap();
 
   // Unlink the mChildren nsAttrAndChildArray.
   for (PRInt32 indx = PRInt32(tmp->mChildren.ChildCount()) - 1;