Remove redundant casts, use NGLayoutInputNode base functions everywhere

third_party/WebKit/Source/core/layout/ng/ng_layout_input_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 NGLayoutInputNode_h
 #define NGLayoutInputNode_h
 
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class ComputedStyle;
 class LayoutObject;
 class NGBreakToken;
 class NGConstraintSpace;
 class NGLayoutResult;
 struct MinMaxContentSize;
 
 // Represents the input to a layout algorithm for a given node. The layout
 // engine should use the style, node type to determine which type of layout
 // algorithm to use to produce fragments for this node.
 class CORE_EXPORT NGLayoutInputNode
     : public GarbageCollectedFinalized<NGLayoutInputNode> {
  public:
   enum NGLayoutInputNodeType { kLegacyBlock = 0, kLegacyInline = 1 };
 
-  bool IsInline() { return type_ == kLegacyInline; }
+  bool IsInline() const { return type_ == kLegacyInline; }
 
-  bool IsBlock() { return type_ == kLegacyBlock; }
+  bool IsBlock() const { return type_ == kLegacyBlock; }
 
   virtual ~NGLayoutInputNode(){};
 
   // Performs layout on this input node, will return the layout result.
   virtual RefPtr<NGLayoutResult> Layout(NGConstraintSpace*, NGBreakToken*) = 0;
 
   // Returns the next sibling.
   virtual NGLayoutInputNode* NextSibling() = 0;
 
   // Returns the LayoutObject which is associated with this node.
@@ skipping 12 matching lines @@
  protected:
   explicit NGLayoutInputNode(NGLayoutInputNodeType type) : type_(type) {}
 
  private:
   unsigned type_ : 1;
 };
 
 }  // namespace blink
 
 #endif  // NGLayoutInputNode_h