[LayoutNG] Switch NGConstraintSpace to being RefCounted.

third_party/WebKit/Source/core/layout/ng/ng_constraint_space_builder.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_builder.h"
 
 #include "core/layout/ng/ng_length_utils.h"
 
 namespace blink {
 
@@ skipping 119 matching lines @@
   is_new_fc_ = is_new_fc;
   return *this;
 }
 
 NGConstraintSpaceBuilder& NGConstraintSpaceBuilder::SetIsAnonymous(
     bool is_anonymous) {
   is_anonymous_ = is_anonymous;
   return *this;
 }
 
-NGConstraintSpace* NGConstraintSpaceBuilder::ToConstraintSpace(
+RefPtr<NGConstraintSpace> NGConstraintSpaceBuilder::ToConstraintSpace(
     NGWritingMode out_writing_mode) {
   // Whether the child and the containing block are parallel to each other.
   // Example: vertical-rl and vertical-lr
   bool is_in_parallel_flow = IsParallelWritingMode(
       static_cast<NGWritingMode>(parent_writing_mode_), out_writing_mode);
 
   NGLogicalSize available_size = available_size_;
   NGLogicalSize percentage_resolution_size = percentage_resolution_size_;
   if (!is_in_parallel_flow) {
     std::swap(available_size.inline_size, available_size.block_size);
@@ skipping 24 matching lines @@
 
   // Reset things that do not pass the Formatting Context boundary.
   std::shared_ptr<NGExclusions> exclusions(
       is_new_fc_ ? std::make_shared<NGExclusions>() : exclusions_);
   NGLogicalOffset bfc_offset = is_new_fc_ ? NGLogicalOffset() : bfc_offset_;
   NGMarginStrut margin_strut = is_new_fc_ ? NGMarginStrut() : margin_strut_;
   WTF::Optional<LayoutUnit> clearance_offset =
       is_new_fc_ ? WTF::nullopt : clearance_offset_;
 
   if (is_in_parallel_flow) {
-    return new NGConstraintSpace(
+    return adoptRef(new NGConstraintSpace(
         static_cast<NGWritingMode>(out_writing_mode),
         static_cast<TextDirection>(text_direction_), available_size,
         percentage_resolution_size, initial_containing_block_size_,
         fragmentainer_space_available_, is_fixed_size_inline_,
         is_fixed_size_block_, is_shrink_to_fit_,
         is_inline_direction_triggers_scrollbar_,
         is_block_direction_triggers_scrollbar_,
         static_cast<NGFragmentationType>(fragmentation_type_), is_new_fc_,
-        is_anonymous_, margin_strut, bfc_offset, exclusions, clearance_offset);
+        is_anonymous_, margin_strut, bfc_offset, exclusions, clearance_offset));
   }
-  return new NGConstraintSpace(
+  return adoptRef(new NGConstraintSpace(
       out_writing_mode, static_cast<TextDirection>(text_direction_),
       available_size, percentage_resolution_size,
       initial_containing_block_size_, fragmentainer_space_available_,
       is_fixed_size_block_, is_fixed_size_inline_, is_shrink_to_fit_,
       is_block_direction_triggers_scrollbar_,
       is_inline_direction_triggers_scrollbar_,
       static_cast<NGFragmentationType>(fragmentation_type_), is_new_fc_,
-      is_anonymous_, margin_strut, bfc_offset, exclusions, clearance_offset);
+      is_anonymous_, margin_strut, bfc_offset, exclusions, clearance_offset));
 }
 
 }  // namespace blink