[LayoutNG] Stack allocate NGLayoutOpportunityIterator.

third_party/WebKit/Source/core/layout/ng/ng_constraint_space.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/layout/ng/ng_constraint_space.h"
 
 #include "core/layout/LayoutBlock.h"
 #include "core/layout/LayoutView.h"
 #include "core/layout/ng/ng_constraint_space_builder.h"
 #include "core/layout/ng/ng_layout_opportunity_iterator.h"
@@ skipping 89 matching lines @@
 }
 
 NGFragmentationType NGConstraintSpace::BlockFragmentationType() const {
   return static_cast<NGFragmentationType>(block_direction_fragmentation_type_);
 }
 
 void NGConstraintSpace::Subtract(const NGBoxFragment*) {
   // TODO(layout-ng): Implement.
 }
 
-NGLayoutOpportunityIterator* NGConstraintSpace::LayoutOpportunities(
-    const WTF::Optional<NGLogicalOffset>& opt_origin_point) {
-  NGLayoutOpportunityIterator* iterator =
-      new NGLayoutOpportunityIterator(this, opt_origin_point);
-  return iterator;
-}
-
 String NGConstraintSpace::ToString() const {
   return String::format("Offset: %s,%s Size: %sx%s MarginStrut: %s",
                         bfc_offset_.inline_offset.toString().ascii().data(),
                         bfc_offset_.block_offset.toString().ascii().data(),
                         AvailableSize().inline_size.toString().ascii().data(),
                         AvailableSize().block_size.toString().ascii().data(),
                         margin_strut_.ToString().ascii().data());
 }
 
 }  // namespace blink