[LayoutNG] Remove unnecessary #includes

third_party/WebKit/Source/core/layout/ng/ng_block_node.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 NGBlockNode_h
 #define NGBlockNode_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_layout_input_node.h"
 #include "platform/heap/Handle.h"
@@ skipping 13 matching lines @@
 // Represents a node to be laid out.
 class CORE_EXPORT NGBlockNode final : public NGLayoutInputNode {
   friend NGLayoutInputNode;
 
  public:
   explicit NGBlockNode(LayoutObject*);
 
   // TODO(layout-ng): make it private and declare a friend class to use in tests
   explicit NGBlockNode(ComputedStyle*);
 
+  ~NGBlockNode() override;
+
   bool Layout(const NGConstraintSpace*, NGFragmentBase**) override;
   NGBlockNode* NextSibling() override;
 
   // Computes the value of min-content and max-content for this box.
   // The return value has the same meaning as for Layout.
   // If the underlying layout algorithm returns NotImplemented from
   // ComputeMinAndMaxContentSizes, this function will synthesize these sizes
   // using Layout with special constraint spaces.
   // It is not legal to interleave a pending Layout() with a pending
   // ComputeOrSynthesizeMinAndMaxContentSizes (i.e. you have to call Layout
@@ skipping 41 matching lines @@
 
 DEFINE_TYPE_CASTS(NGBlockNode,
                   NGLayoutInputNode,
                   node,
                   node->Type() == NGLayoutInputNode::kLegacyBlock,
                   node.Type() == NGLayoutInputNode::kLegacyBlock);
 
 }  // namespace blink
 
 #endif  // NGBlockNode