Don't reuse old ids in table info

Nodes that are now ignored should not be considered cells.

Bug: 1061248
Change-Id: Ic0118c58a696dc52f6528e7a9e1da34cc1eef885
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144423Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758101}

ui/accessibility/ax_table_info.cc

@@ -157,6 +157,8 @@ void AXTableInfo::ClearVectors() {
   unique_cell_ids.clear();
   cell_data_vector.clear();
   row_nodes.clear();
+  cell_id_to_index.clear();
+  row_id_to_index.clear();
 }
 
 void AXTableInfo::BuildCellDataVectorFromRowAndCellNodes(