Remove ACCELERATED_OVERFLOW_SCROLLING as it is always off.

Source/core/css/CSSParser.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 815 matching lines @@
         break;
     case CSSPropertyWebkitMarqueeDirection:
         if (valueID == CSSValueForwards || valueID == CSSValueBackwards || valueID == CSSValueAhead || valueID == CSSValueReverse || valueID == CSSValueLeft || valueID == CSSValueRight || valueID == CSSValueDown
             || valueID == CSSValueUp || valueID == CSSValueAuto)
             return true;
         break;
     case CSSPropertyWebkitMarqueeStyle:
         if (valueID == CSSValueNone || valueID == CSSValueSlide || valueID == CSSValueScroll || valueID == CSSValueAlternate)
             return true;
         break;
-#if ENABLE(ACCELERATED_OVERFLOW_SCROLLING)
-    case CSSPropertyWebkitOverflowScrolling:
-        if (valueID == CSSValueAuto || valueID == CSSValueTouch)
-            return true;
-        break;
-#endif
     case CSSPropertyWebkitPrintColorAdjust:
         if (valueID == CSSValueExact || valueID == CSSValueEconomy)
             return true;
         break;
     case CSSPropertyWebkitRegionBreakAfter:
     case CSSPropertyWebkitRegionBreakBefore:
         if (RuntimeEnabledFeatures::cssRegionsEnabled() && (valueID == CSSValueAuto || valueID == CSSValueAlways || valueID == CSSValueAvoid || valueID == CSSValueLeft || valueID == CSSValueRight))
             return true;
         break;
     case CSSPropertyWebkitRegionBreakInside:
@@ skipping 154 matching lines @@
     case CSSPropertyGridAutoFlow:
     case CSSPropertyWebkitLineAlign:
     case CSSPropertyWebkitLineBreak:
     case CSSPropertyWebkitLineSnap:
     case CSSPropertyWebkitMarginAfterCollapse:
     case CSSPropertyWebkitMarginBeforeCollapse:
     case CSSPropertyWebkitMarginBottomCollapse:
     case CSSPropertyWebkitMarginTopCollapse:
     case CSSPropertyWebkitMarqueeDirection:
     case CSSPropertyWebkitMarqueeStyle:
-#if ENABLE(ACCELERATED_OVERFLOW_SCROLLING)
-    case CSSPropertyWebkitOverflowScrolling:
-#endif
     case CSSPropertyWebkitPrintColorAdjust:
     case CSSPropertyWebkitRegionBreakAfter:
     case CSSPropertyWebkitRegionBreakBefore:
     case CSSPropertyWebkitRegionBreakInside:
     case CSSPropertyWebkitRegionFragment:
     case CSSPropertyWebkitRtlOrdering:
     case CSSPropertyWebkitRubyPosition:
 #if ENABLE(CSS3_TEXT)
     case CSSPropertyWebkitTextAlignLast:
 #endif // CSS3_TEXT
@@ skipping 1776 matching lines @@
     case CSSPropertyGridAutoFlow:
     case CSSPropertyWebkitLineAlign:
     case CSSPropertyWebkitLineBreak:
     case CSSPropertyWebkitLineSnap:
     case CSSPropertyWebkitMarginAfterCollapse:
     case CSSPropertyWebkitMarginBeforeCollapse:
     case CSSPropertyWebkitMarginBottomCollapse:
     case CSSPropertyWebkitMarginTopCollapse:
     case CSSPropertyWebkitMarqueeDirection:
     case CSSPropertyWebkitMarqueeStyle:
-#if ENABLE(ACCELERATED_OVERFLOW_SCROLLING)
-    case CSSPropertyWebkitOverflowScrolling:
-#endif
     case CSSPropertyWebkitPrintColorAdjust:
     case CSSPropertyWebkitRegionBreakAfter:
     case CSSPropertyWebkitRegionBreakBefore:
     case CSSPropertyWebkitRegionBreakInside:
     case CSSPropertyWebkitRegionFragment:
     case CSSPropertyWebkitRtlOrdering:
     case CSSPropertyWebkitRubyPosition:
 #if ENABLE(CSS3_TEXT)
     case CSSPropertyWebkitTextAlignLast:
 #endif // CSS3_TEXT
@@ skipping 8971 matching lines @@
 {
     // The tokenizer checks for the construct of an+b.
     // However, since the {ident} rule precedes the {nth} rule, some of those
     // tokens are identified as string literal. Furthermore we need to accept
     // "odd" and "even" which does not match to an+b.
     return equalIgnoringCase(token, "odd") || equalIgnoringCase(token, "even")
         || equalIgnoringCase(token, "n") || equalIgnoringCase(token, "-n");
 }
 
 }