[LayoutNG] Switch NGConstraintSpace to being RefCounted.

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

 // Copyright 2017 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_units.h"
 
 #include "core/layout/LayoutTestHelper.h"
 
 namespace blink {
@@ skipping 15 matching lines @@
   NGConstraintSpaceBuilder horizontal_builder(kHorizontalTopBottom);
   NGLogicalSize fixed_size{LayoutUnit(100), LayoutUnit(200)};
   NGLogicalSize indefinite_size{NGSizeIndefinite, NGSizeIndefinite};
   NGPhysicalSize icb_size{NGSizeIndefinite, LayoutUnit(51)};
 
   horizontal_builder.SetInitialContainingBlockSize(icb_size);
   horizontal_builder.SetAvailableSize(fixed_size);
   horizontal_builder.SetPercentageResolutionSize(fixed_size);
 
   NGConstraintSpaceBuilder vertical_builder(
-      horizontal_builder.ToConstraintSpace(kHorizontalTopBottom));
+      horizontal_builder.ToConstraintSpace(kHorizontalTopBottom).get());
 
   vertical_builder.SetAvailableSize(indefinite_size);
   vertical_builder.SetPercentageResolutionSize(indefinite_size);
-  NGConstraintSpace* space =
+  RefPtr<NGConstraintSpace> space =
       vertical_builder.ToConstraintSpace(kVerticalLeftRight);
 
   EXPECT_EQ(space->AvailableSize().inline_size, icb_size.height);
   EXPECT_EQ(space->PercentageResolutionSize().inline_size, icb_size.height);
 };
 
 // Asserts that indefinite inline length becomes initial containing
 // block height for vertical-lr inside horizontal document.
 TEST(NGConstraintSpaceBuilderTest, AvailableSizeFromVerticalICB) {
   NGConstraintSpaceBuilder horizontal_builder(kVerticalLeftRight);
   NGLogicalSize fixed_size{LayoutUnit(100), LayoutUnit(200)};
   NGLogicalSize indefinite_size{NGSizeIndefinite, NGSizeIndefinite};
   NGPhysicalSize icb_size{LayoutUnit(51), NGSizeIndefinite};
 
   horizontal_builder.SetInitialContainingBlockSize(icb_size);
   horizontal_builder.SetAvailableSize(fixed_size);
   horizontal_builder.SetPercentageResolutionSize(fixed_size);
 
   NGConstraintSpaceBuilder vertical_builder(
-      horizontal_builder.ToConstraintSpace(kVerticalLeftRight));
+      horizontal_builder.ToConstraintSpace(kVerticalLeftRight).get());
 
   vertical_builder.SetAvailableSize(indefinite_size);
   vertical_builder.SetPercentageResolutionSize(indefinite_size);
-  NGConstraintSpace* space =
+  RefPtr<NGConstraintSpace> space =
       vertical_builder.ToConstraintSpace(kHorizontalTopBottom);
 
   EXPECT_EQ(space->AvailableSize().inline_size, icb_size.width);
   EXPECT_EQ(space->PercentageResolutionSize().inline_size, icb_size.width);
 };
 
 }  // namespace
 
 }  // namespace blink