Make NGFragment to own NGPhysicalFragment

third_party/WebKit/Source/core/layout/ng/ng_layout_opportunity_iterator.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_layout_opportunity_iterator.h"
 
 #include "core/layout/ng/ng_physical_constraint_space.h"
 #include "core/layout/ng/ng_units.h"
 #include "wtf/NonCopyingSort.h"
 
@@ skipping 18 matching lines @@
                                            const NGExclusion& b) {
   if (a.Top() < b.Top())
     return true;
   if (a.Top() > b.Top())
     return false;
   return a.Left() < b.Left();
 }
 
 void NGLayoutOpportunityIterator::FilterExclusions() {
   filtered_exclusions_.clear();
-  for (const auto& item : constraint_space_->PhysicalSpace()->Exclusions())
+  for (const auto& item : constraint_space_->PhysicalSpace().Exclusions())
     filtered_exclusions_.append(item);
   nonCopyingSort(filtered_exclusions_.begin(), filtered_exclusions_.end(),
                  AscendingTopLeftCompare);
 
   // TODO(eae): Writing modes.
   LayoutUnit left = constraint_space_->Offset().inline_offset;
   LayoutUnit top = constraint_space_->Offset().block_offset;
   LayoutUnit right = left + constraint_space_->Size().inline_size;
   LayoutUnit bottom = top + constraint_space_->Size().block_size;
 
@@ skipping 168 matching lines @@
 void NGLayoutOpportunityIterator::addLayoutOpportunity(LayoutUnit left,
                                                        LayoutUnit top,
                                                        LayoutUnit right,
                                                        LayoutUnit bottom) {
   current_opportunities_.append(
       new NGConstraintSpace(*constraint_space_, NGLogicalOffset(left, top),
                             NGLogicalSize(right - left, bottom - top)));
 }
 
 }  // namespace blink