Remove unused function UndoStep::belongsTo()

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

 /*
  * Copyright (C) 2005, 2006, 2007, 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 82 matching lines @@
     const VisibleSelection& startingSelection,
     const VisibleSelection& endingSelection,
     InputEvent::InputType inputType)
     : m_document(document),
       m_startingSelection(startingSelection),
       m_endingSelection(endingSelection),
       m_startingRootEditableElement(startingSelection.rootEditableElement()),
       m_endingRootEditableElement(endingSelection.rootEditableElement()),
       m_inputType(inputType) {}
 
-bool EditCommandComposition::belongsTo(const LocalFrame& frame) const {
-  DCHECK(m_document);
-  return m_document->frame() == &frame;
-}
-
 void EditCommandComposition::unapply() {
   DCHECK(m_document);
   LocalFrame* frame = m_document->frame();
   DCHECK(frame);
 
   // Changes to the document may have been made since the last editing operation
   // that require a layout, as in <rdar://problem/5658603>. Low level
   // operations, like RemoveNodeCommand, don't require a layout because the high
   // level operations that use them perform one if one is necessary (like for
   // the creation of VisiblePositions).
@@ skipping 1912 matching lines @@
   return node;
 }
 
 DEFINE_TRACE(CompositeEditCommand) {
   visitor->trace(m_commands);
   visitor->trace(m_composition);
   EditCommand::trace(visitor);
 }
 
 }  // namespace blink