Rename renderer() to layoutObject().

Source/core/layout/LayoutText.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004-2009, 2013 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 216 matching lines @@
 }
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutText, isText());
 
 #if !ENABLE(ASSERT)
 inline void LayoutText::checkConsistency() const
 {
 }
 #endif
 
-inline LayoutText* Text::renderer() const
+inline LayoutText* Text::layoutObject() const
 {
-    return toLayoutText(CharacterData::renderer());
+    return toLayoutText(CharacterData::layoutObject());
 }
 
 void applyTextTransform(const LayoutStyle*, String&, UChar);
 
 } // namespace blink
 
 #endif // LayoutText_h