[LayoutNG] Switch NGConstraintSpace to being RefCounted.

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

Index: third_party/WebKit/Source/core/layout/ng/ng_inline_node_test.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_inline_node_test.cc b/third_party/WebKit/Source/core/layout/ng/ng_inline_node_test.cc
index 031605191cb1e817ebb66c6e576b8f3b5890cdeb..482e823f0d88a987cd18f3a5ecc38aab3a874f38 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_inline_node_test.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_inline_node_test.cc
@@ -78,12 +78,12 @@ class NGInlineNodeTest : public RenderingTest {
 
   void CreateLine(NGInlineNode* node,
                   Vector<RefPtr<const NGPhysicalTextFragment>>* fragments_out) {
-    NGConstraintSpace* constraint_space =
+    RefPtr<NGConstraintSpace> constraint_space =
         NGConstraintSpaceBuilder(kHorizontalTopBottom)
             .ToConstraintSpace(kHorizontalTopBottom);
-    NGLineBuilder line_builder(node, constraint_space);
+    NGLineBuilder line_builder(node, constraint_space.get());
 
-    NGTextLayoutAlgorithm algorithm(node, constraint_space);
+    NGTextLayoutAlgorithm algorithm(node, constraint_space.get());
     algorithm.LayoutInline(&line_builder);
 
     NGFragmentBuilder fragment_builder(NGPhysicalFragment::kFragmentBox, node);