[LayoutNG] Don't pass parent NGFragmentBuilder into NGLineBuilder.

third_party/WebKit/Source/core/layout/ng/ng_inline_node_test.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_inline_node.h"
 
 #include "core/layout/LayoutTestHelper.h"
 #include "core/layout/ng/ng_constraint_space.h"
 #include "core/layout/ng/ng_constraint_space_builder.h"
 #include "core/layout/ng/ng_fragment_builder.h"
@@ skipping 71 matching lines @@
     if (!layout_block_flow_)
       SetupHtml("t", "<div id=t style='font:10px'>test</div>");
     return new NGInlineNodeForTest(layout_object_, layout_block_flow_);
   }
 
   void CreateLine(NGInlineNode* node,
                   Vector<RefPtr<const NGPhysicalTextFragment>>* fragments_out) {
     RefPtr<NGConstraintSpace> constraint_space =
         NGConstraintSpaceBuilder(kHorizontalTopBottom)
             .ToConstraintSpace(kHorizontalTopBottom);
-    NGLineBuilder line_builder(node, constraint_space.get(), nullptr);
+    NGLineBuilder line_builder(node, constraint_space.get());
 
     NGTextLayoutAlgorithm algorithm(node);
     algorithm.LayoutInline(&line_builder);
 
     RefPtr<NGLayoutResult> result = line_builder.CreateFragments();
     for (const auto& child :
          toNGPhysicalBoxFragment(result->PhysicalFragment().get())
              ->Children()) {
       fragments_out->push_back(toNGPhysicalTextFragment(child.get()));
     }
@@ skipping 148 matching lines @@
   MinMaxContentSize sizes = node->ComputeMinMaxContentSize();
   // |min_content| should be the width of "BC" because there is an element
   // boundary between "B" and "C" but no break opportunities.
   // TODO(kojii): min_content should be 20, but is 30 until NGLineBuilder
   // implements trailing spaces correctly.
   EXPECT_EQ(30, sizes.min_content);
   EXPECT_EQ(60, sizes.max_content);
 }
 
 }  // namespace blink