[LayoutNG] Remove the ng_layout_coordinator and temporary LayoutSync method.

third_party/WebKit/Source/core/layout/ng/ng_layout_coordinator.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 NGLayoutCoordinator_h
-#define NGLayoutCoordinator_h
-
-#include "core/CoreExport.h"
-#include "core/layout/ng/ng_layout_algorithm.h"
-#include "platform/heap/Handle.h"
-#include "wtf/Vector.h"
-
-namespace blink {
-
-class NGLayoutInputNode;
-class NGConstraintSpace;
-
-class CORE_EXPORT NGLayoutCoordinator final
-    : public GarbageCollectedFinalized<NGLayoutCoordinator> {
- public:
-  NGLayoutCoordinator(NGLayoutInputNode*, NGConstraintSpace*);
-
-  bool Tick(NGPhysicalFragment**);
-
-  DECLARE_TRACE()
-
-  const HeapVector<Member<NGLayoutAlgorithm>>& GetAlgorithmStackForTesting()
-      const {
-    return layout_algorithms_;
-  };
-
- private:
-  HeapVector<Member<NGLayoutAlgorithm>> layout_algorithms_;
-  Member<NGPhysicalFragment> fragment_;
-};
-}
-
-#endif