Remove some dead code from rendering/ folder

Source/core/rendering/RenderText.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 118 matching lines @@
 
     virtual int previousOffset(int current) const OVERRIDE FINAL;
     virtual int previousOffsetForBackwardDeletion(int current) const OVERRIDE FINAL;
     virtual int nextOffset(int current) const OVERRIDE FINAL;
 
     bool containsReversedText() const { return m_containsReversedText; }
 
     bool isSecure() const { return style()->textSecurity() != TSNONE; }
     void momentarilyRevealLastTypedCharacter(unsigned lastTypedCharacterOffset);
 
-    InlineTextBox* findNextInlineTextBox(int offset, int& pos) const;
-
     void checkConsistency() const;
 
     bool isAllCollapsibleWhitespace() const;
 
     bool canUseSimpleFontCodePath() const { return m_canUseSimpleFontCodePath; }
     bool knownToHaveNoOverflowAndNoFallbackFonts() const { return m_knownToHaveNoOverflowAndNoFallbackFonts; }
 
     void removeAndDestroyTextBoxes();
 
     PassRefPtr<AbstractInlineTextBox> firstAbstractInlineTextBox();
@@ skipping 80 matching lines @@
 inline void RenderText::checkConsistency() const
 {
 }
 #endif
 
 void applyTextTransform(const RenderStyle*, String&, UChar);
 
 } // namespace WebCore
 
 #endif // RenderText_h