layout: Introduce support for legacy presentational attributes to selector

matching, and use it for `<input size>` and `<td width>`.

This implements a general framework for legacy presentational attributes
to the DOM and style calculation, so that adding more of them later will
be straightforward.

components/layout/table_colgroup.rs

@@ -53,7 +53,7 @@ impl Flow for TableColGroupFlow {
         self
     }
 
-    fn bubble_inline_sizes(&mut self, _: &LayoutContext) {
+    fn bubble_inline_sizes(&mut self) {
         let _scope = layout_debug_scope!("table_colgroup::bubble_inline_sizes {:s}",
                                             self.base.debug_id());