Remove ACCELERATED_OVERFLOW_SCROLLING as it is always off.

Source/core/css/CSSComputedStyleDeclaration.cpp

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
@@ skipping 280 matching lines @@
     CSSPropertyWebkitMaskBoxImageSource,
     CSSPropertyWebkitMaskBoxImageWidth,
     CSSPropertyWebkitMaskClip,
     CSSPropertyWebkitMaskComposite,
     CSSPropertyWebkitMaskImage,
     CSSPropertyWebkitMaskOrigin,
     CSSPropertyWebkitMaskPosition,
     CSSPropertyWebkitMaskRepeat,
     CSSPropertyWebkitMaskSize,
     CSSPropertyWebkitOrder,
-#if ENABLE(ACCELERATED_OVERFLOW_SCROLLING)
-    CSSPropertyWebkitOverflowScrolling,
-#endif
     CSSPropertyWebkitPerspective,
     CSSPropertyWebkitPerspectiveOrigin,
     CSSPropertyWebkitPrintColorAdjust,
     CSSPropertyWebkitRtlOrdering,
     CSSPropertyWebkitShapeInside,
     CSSPropertyWebkitShapeOutside,
     CSSPropertyWebkitTapHighlightColor,
     CSSPropertyWebkitTextCombine,
     CSSPropertyWebkitTextDecorationsInEffect,
     CSSPropertyWebkitTextEmphasisColor,
@@ skipping 2094 matching lines @@
             return cssValuePool().createIdentifierValue(CSSValueNone);
         case CSSPropertyWebkitFontSizeDelta:
             // Not a real style property -- used by the editing engine -- so has no computed value.
             break;
         case CSSPropertyWebkitMarginBottomCollapse:
         case CSSPropertyWebkitMarginAfterCollapse:
             return cssValuePool().createValue(style->marginAfterCollapse());
         case CSSPropertyWebkitMarginTopCollapse:
         case CSSPropertyWebkitMarginBeforeCollapse:
             return cssValuePool().createValue(style->marginBeforeCollapse());
-#if ENABLE(ACCELERATED_OVERFLOW_SCROLLING)
-        case CSSPropertyWebkitOverflowScrolling:
-            if (!style->useTouchOverflowScrolling())
-                return cssValuePool().createIdentifierValue(CSSValueAuto);
-            return cssValuePool().createIdentifierValue(CSSValueTouch);
-#endif
         case CSSPropertyWebkitPerspective:
             if (!style->hasPerspective())
                 return cssValuePool().createIdentifierValue(CSSValueNone);
             return zoomAdjustedPixelValue(style->perspective(), style.get());
         case CSSPropertyWebkitPerspectiveOrigin: {
             RefPtr<CSSValueList> list = CSSValueList::createSpaceSeparated();
             if (renderer) {
                 LayoutRect box;
                 if (renderer->isBox())
                     box = toRenderBox(renderer)->borderBoxRect();
@@ skipping 559 matching lines @@
     static const CSSPropertyID propertiesAfterSlashSeperator[3] = { CSSPropertyBackgroundSize, CSSPropertyBackgroundOrigin, 
                                                                     CSSPropertyBackgroundClip };
 
     RefPtr<CSSValueList> list = CSSValueList::createSlashSeparated();
     list->append(getCSSPropertyValuesForShorthandProperties(StylePropertyShorthand(propertiesBeforeSlashSeperator, WTF_ARRAY_LENGTH(propertiesBeforeSlashSeperator))));
     list->append(getCSSPropertyValuesForShorthandProperties(StylePropertyShorthand(propertiesAfterSlashSeperator, WTF_ARRAY_LENGTH(propertiesAfterSlashSeperator))));
     return list.release();
 }
 
 } // namespace WebCore