Remove pure-virtual interface UndoStep

third_party/WebKit/Source/core/editing/commands/UndoStep.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 #define UndoStep_h
 
 #include "core/editing/VisibleSelection.h"
 #include "core/events/InputEvent.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class SimpleEditCommand;
 
-// TODO(xiaochengh): Get rid of this interface, and then rename
-// |EditCommandComposition| to |UndoStep|.
-class UndoStep : public GarbageCollectedFinalized<UndoStep> {
- public:
-  virtual ~UndoStep() {}
-  DEFINE_INLINE_VIRTUAL_TRACE() {}
-
-  virtual void unapply() = 0;
-  virtual void reapply() = 0;
-  virtual InputEvent::InputType inputType() const = 0;
-};
-
-class EditCommandComposition final : public UndoStep {
+// TODO(xiaochengh): Rename this class to |UndoStep|.
+class EditCommandComposition
+    : public GarbageCollectedFinalized<EditCommandComposition> {
  public:
   static EditCommandComposition* create(Document*,
                                         const VisibleSelection&,
                                         const VisibleSelection&,
                                         InputEvent::InputType);
 
-  void unapply() override;
-  void reapply() override;
-  InputEvent::InputType inputType() const override;
+  void unapply();
+  void reapply();
+  InputEvent::InputType inputType() const;
   void append(SimpleEditCommand*);
   void append(EditCommandComposition*);
 
   const VisibleSelection& startingSelection() const {
     return m_startingSelection;
   }
   const VisibleSelection& endingSelection() const { return m_endingSelection; }
   void setStartingSelection(const VisibleSelection&);
   void setEndingSelection(const VisibleSelection&);
   Element* startingRootEditableElement() const {
     return m_startingRootEditableElement.get();
   }
   Element* endingRootEditableElement() const {
     return m_endingRootEditableElement.get();
   }
 
-  DECLARE_VIRTUAL_TRACE();
+  DECLARE_TRACE();
 
  private:
   EditCommandComposition(Document*,
                          const VisibleSelection& startingSelection,
                          const VisibleSelection& endingSelection,
                          InputEvent::InputType);
 
   Member<Document> m_document;
   VisibleSelection m_startingSelection;
   VisibleSelection m_endingSelection;
   HeapVector<Member<SimpleEditCommand>> m_commands;
   Member<Element> m_startingRootEditableElement;
   Member<Element> m_endingRootEditableElement;
   InputEvent::InputType m_inputType;
 };
 
 }  // namespace blink
 
 #endif