[layoutng] Remove some unnecessary overflow computation

ComputeOverflow already calls these functions

Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: I1af510148708078689fb421a750ae8d2eb82087a
Reviewed-on: https://chromium-review.googlesource.com/c/1287249Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600788}

third_party/blink/renderer/core/layout/ng/ng_block_node.cc

@@ -585,11 +585,6 @@ void NGBlockNode::CopyFragmentDataToLayoutBox(
   if (box_->IsLayoutBlockFlow()) {
     LayoutBlockFlow* block_flow = ToLayoutBlockFlow(box_);
     block_flow->UpdateIsSelfCollapsing();
-
-    if (constraint_space.IsNewFormattingContext()) {
-      block_flow->AddVisualOverflowFromFloats();
-      block_flow->AddLayoutOverflowFromFloats();
-    }
   }
 }