Remove unused Editor::*SelectionListLevel*(), and ModifySelectionListLevel.{cpp,h}.

Source/core/editing/Editor.h

 /*
  * Copyright (C) 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 96 matching lines @@
     void respondToChangedContents(const VisibleSelection& endingSelection);
 
     bool selectionStartHasStyle(CSSPropertyID, const String& value) const;
     TriState selectionHasStyle(CSSPropertyID, const String& value) const;
     String selectionStartCSSPropertyValue(CSSPropertyID);
 
     TriState selectionUnorderedListState() const;
     TriState selectionOrderedListState() const;
     PassRefPtr<Node> insertOrderedList();
     PassRefPtr<Node> insertUnorderedList();
-    bool canIncreaseSelectionListLevel();
-    bool canDecreaseSelectionListLevel();
-    PassRefPtr<Node> increaseSelectionListLevel();
-    PassRefPtr<Node> increaseSelectionListLevelOrdered();
-    PassRefPtr<Node> increaseSelectionListLevelUnordered();
-    void decreaseSelectionListLevel();
 
     void removeFormattingAndStyle();
 
     void clearLastEditCommand();
 
     bool deleteWithDirection(SelectionDirection, TextGranularity, bool killRing, bool isTypingAction);
     void deleteSelectionWithSmartDelete(bool smartDelete);
 
     void applyStyle(StylePropertySet*, EditAction = EditActionUnspecified);
     void applyParagraphStyle(StylePropertySet*, EditAction = EditActionUnspecified);
@@ skipping 165 matching lines @@
 
 inline bool Editor::markedTextMatchesAreHighlighted() const
 {
     return m_areMarkedTextMatchesHighlighted;
 }
 
 
 } // namespace WebCore
 
 #endif // Editor_h