layout: Improve logic for block size of table (#34947)

The containing block for children already has the size coming from the
style and the rules of the parent formatting context, so no need to try
to recompute it.

This allows removing a bunch of functions, and fixes some problems when
the table is a flex item.

Signed-off-by: Oriol Brufau <obrufau@igalia.com>

components/layout_2020/geom.rs

@@ -733,22 +733,6 @@ impl From<StyleMaxSize> for Size<LengthPercentage> {
 }
 
 impl LogicalVec2<Size<LengthPercentage>> {
-    pub(crate) fn percentages_relative_to(
-        &self,
-        containing_block: &ContainingBlock,
-    ) -> LogicalVec2<Size<Au>> {
-        self.map_inline_and_block_axes(
-            |inline_size| inline_size.map(|lp| lp.to_used_value(containing_block.size.inline)),
-            |block_size| {
-                block_size
-                    .maybe_map(|lp| {
-                        lp.maybe_to_used_value(containing_block.size.block.to_definite())
-                    })
-                    .unwrap_or_default()
-            },
-        )
-    }
-
     pub(crate) fn maybe_percentages_relative_to_basis(
         &self,
         basis: &LogicalVec2<Option<Au>>,