[LayoutNG] Remove the ng_layout_coordinator and temporary LayoutSync method.

third_party/WebKit/Source/core/layout/ng/ng_legacy_block_layout_algorithm.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 NGLegacyBlockLayoutAlgorithm_h
 #define NGLegacyBlockLayoutAlgorithm_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_block_node.h"
 #include "core/layout/ng/ng_constraint_space.h"
 #include "core/layout/ng/ng_layout_algorithm.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 // A class for legacy block layout (blocks that can't be handled by NG yet).
 // Defers to the old layout method of the block
 class CORE_EXPORT NGLegacyBlockLayoutAlgorithm : public NGLayoutAlgorithm {
  public:
   NGLegacyBlockLayoutAlgorithm(NGBlockNode*, const NGConstraintSpace*);
 
-  NGLayoutStatus Layout(NGPhysicalFragment*,
-                        NGPhysicalFragment**,
-                        NGLayoutAlgorithm**) override;
+  NGPhysicalFragment* Layout() override;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   Member<NGBlockNode> block_;
   Member<const NGConstraintSpace> constraint_space_;
 };
 }
 
 #endif  // NGLegacyBlockLayoutAlgorithm_h