Position info (item n of m) incorrect if hidden focusable items in list

Bug: 836997
Change-Id: I971fa7076f72d51829b36af8e379260d48ca25ec
Reviewed-on: https://chromium-review.googlesource.com/c/1450235
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628890}
void AXTree::SetEnableExtraMacNodes(bool enabled) {
  DCHECK(enable_extra_mac_nodes_ != enabled);
  DCHECK_EQ(0U, table_info_map_.size());
  enable_extra_mac_nodes_ = enabled;
}

void AXTree::SetEnableExtraMacNodes(bool enabled) {
  DCHECK(enable_extra_mac_nodes_ != enabled);
  DCHECK_EQ(0U, table_info_map_.size());
  enable_extra_mac_nodes_ = enabled;
}
