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

third_party/WebKit/Source/core/layout/ng/ng_line_builder.h

 // 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.
 
 #ifndef NGLineBuilder_h
 #define NGLineBuilder_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/geometry/ng_logical_offset.h"
 #include "core/layout/ng/ng_fragment_builder.h"
@@ skipping 13 matching lines @@
 
 // NGLineBuilder creates the fragment tree for a line.
 // NGLineBuilder manages the current line as a range, |start| and |end|.
 // |end| can be extended multiple times before creating a line, usually until
 // |!CanFitOnLine()|.
 // |SetBreakOpportunity| can mark the last confirmed offset that can fit.
 class CORE_EXPORT NGLineBuilder final {
   STACK_ALLOCATED();
 
  public:
-  NGLineBuilder(NGInlineNode*, NGConstraintSpace*, NGFragmentBuilder*);
+  NGLineBuilder(NGInlineNode*, NGConstraintSpace*);
 
   const NGConstraintSpace& ConstraintSpace() const {
     return *constraint_space_;
   }
 
   LayoutUnit MaxInlineSize() const { return max_inline_size_; }
 
   // Returns if the current items fit on a line.
   bool CanFitOnLine() const;
 
@@ skipping 107 matching lines @@
   LayoutUnit PlaceAtomicInline(const NGLayoutInlineItem&,
                                LayoutUnit estimated_baseline,
                                LineBoxData*,
                                NGFragmentBuilder*);
 
   // Finds the next layout opportunity for the next text fragment.
   void FindNextLayoutOpportunity();
 
   Persistent<NGInlineNode> inline_box_;
   NGConstraintSpace* constraint_space_;  // Not owned as STACK_ALLOCATED.
-  NGFragmentBuilder* containing_block_builder_;
   Vector<RefPtr<NGLayoutResult>, 32> layout_results_;
   Vector<LineBoxData, 32> line_box_data_list_;
   unsigned start_index_ = 0;
   unsigned start_offset_ = 0;
   unsigned last_index_ = 0;
   unsigned end_offset_ = 0;
   unsigned last_break_opportunity_index_ = 0;
   unsigned last_break_opportunity_offset_ = 0;
   LayoutUnit end_position_;
   LayoutUnit last_break_opportunity_position_;
   LayoutUnit content_size_;
   LayoutUnit max_inline_size_;
   NGFragmentBuilder container_builder_;
   RefPtr<NGLayoutResult> container_layout_result_;
   FontBaseline baseline_type_ = FontBaseline::AlphabeticBaseline;
 
   NGLogicalOffset bfc_offset_;
   NGLogicalRect current_opportunity_;
 
   unsigned is_horizontal_writing_mode_ : 1;
 #if DCHECK_IS_ON()
   unsigned is_bidi_reordered_ : 1;
 #endif
 };
 
 }  // namespace blink
 
 #endif  // NGLineBuilder_h