Fix Table Caption infinite recursion.

components/layout/table_caption.rs

@@ -82,7 +82,7 @@ impl Flow for TableCaptionFlow {
     }
 
     fn iterate_through_fragment_bounds(&self, iterator: &mut FragmentBoundsIterator) {
-        self.iterate_through_fragment_bounds(iterator);
+        self.block_flow.iterate_through_fragment_bounds(iterator);
     }
 }