Remove ACCELERATED_OVERFLOW_SCROLLING as it is always off.

Source/core/rendering/style/StyleRareInheritedData.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 86 matching lines @@
     unsigned textEmphasisPosition : 1; // TextEmphasisPosition
     unsigned m_textOrientation : 2; // TextOrientation
 #if ENABLE(CSS3_TEXT)
     unsigned m_textIndentLine : 1; // TextIndentEachLine
 #endif
     unsigned m_lineBoxContain: 7; // LineBoxContain
     // CSS Image Values Level 3
     unsigned m_imageRendering : 2; // EImageRendering
     unsigned m_lineSnap : 2; // LineSnap
     unsigned m_lineAlign : 1; // LineAlign
-#if ENABLE(ACCELERATED_OVERFLOW_SCROLLING)
-    unsigned useTouchOverflowScrolling: 1;
-#endif
 #if ENABLE(CSS3_TEXT)
     unsigned m_textAlignLast : 3; // TextAlignLast
     unsigned m_textUnderlinePosition : 3; // TextUnderlinePosition
 #endif // CSS3_TEXT
     unsigned m_rubyPosition : 1; // RubyPosition
 
     AtomicString hyphenationString;
     short hyphenationLimitBefore;
     short hyphenationLimitAfter;
     short hyphenationLimitLines;
@@ skipping 11 matching lines @@
     DataRef<StyleVariableData> m_variables;
 
 private:
     StyleRareInheritedData();
     StyleRareInheritedData(const StyleRareInheritedData&);
 };
 
 } // namespace WebCore
 
 #endif // StyleRareInheritedData_h