Remove unused function UndoStep::belongsTo()

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

 /*
  * Copyright (C) 2005, 2006, 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 33 matching lines @@
 
 enum class EditCommandSource { kMenuOrKeyBinding, kDOM };
 
 class EditCommandComposition final : public UndoStep {
  public:
   static EditCommandComposition* create(Document*,
                                         const VisibleSelection&,
                                         const VisibleSelection&,
                                         InputEvent::InputType);
 
-  bool belongsTo(const LocalFrame&) const override;
   void unapply() override;
   void reapply() override;
   InputEvent::InputType inputType() const override;
   void append(SimpleEditCommand*);
   void append(EditCommandComposition*);
 
   const VisibleSelection& startingSelection() const {
     return m_startingSelection;
   }
   const VisibleSelection& endingSelection() const { return m_endingSelection; }
@@ skipping 207 matching lines @@
 
 DEFINE_TYPE_CASTS(CompositeEditCommand,
                   EditCommand,
                   command,
                   command->isCompositeEditCommand(),
                   command.isCompositeEditCommand());
 
 }  // namespace blink
 
 #endif  // CompositeEditCommand_h