Remove ACCELERATED_OVERFLOW_SCROLLING as it is always off.

Source/core/css/CSSProperty.cpp

 /**
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 312 matching lines @@
     case CSSPropertyWebkitHyphenateCharacter:
     case CSSPropertyWebkitHyphenateLimitAfter:
     case CSSPropertyWebkitHyphenateLimitBefore:
     case CSSPropertyWebkitHyphenateLimitLines:
     case CSSPropertyWebkitHyphens:
     case CSSPropertyWebkitLineAlign:
     case CSSPropertyWebkitLineBoxContain:
     case CSSPropertyWebkitLineBreak:
     case CSSPropertyWebkitLineGrid:
     case CSSPropertyWebkitLineSnap:
-#if ENABLE(ACCELERATED_OVERFLOW_SCROLLING)
-    case CSSPropertyWebkitOverflowScrolling:
-#endif
     case CSSPropertyWebkitPrintColorAdjust:
     case CSSPropertyWebkitRtlOrdering:
     case CSSPropertyWebkitRubyPosition:
     case CSSPropertyWebkitTapHighlightColor:
     case CSSPropertyWebkitTextCombine:
 #if ENABLE(CSS3_TEXT)
     case CSSPropertyWebkitTextAlignLast:
     case CSSPropertyWebkitTextUnderlinePosition:
 #endif // CSS3_TEXT
     case CSSPropertyWebkitTextDecorationsInEffect:
@@ skipping 326 matching lines @@
 }
 
 void CSSProperty::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 {
     MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::CSS);
     info.addMember(m_value, "value");
     info.ignoreMember(m_metadata);
 }
 
 } // namespace WebCore