Remove more scrolling code from Sky

sky/engine/core/css/resolver/CSSToStyleMap.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 49 matching lines @@
     }
 
     if (!value->isPrimitiveValue())
         return;
 
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
     switch (primitiveValue->getValueID()) {
     case CSSValueFixed:
         layer->setAttachment(FixedBackgroundAttachment);
         break;
-    case CSSValueScroll:
-        layer->setAttachment(ScrollBackgroundAttachment);
-        break;
     case CSSValueLocal:
         layer->setAttachment(LocalBackgroundAttachment);
         break;
     default:
         return;
     }
 }
 
 void CSSToStyleMap::mapFillClip(FillLayer* layer, CSSValue* value) const
 {
@@ skipping 511 matching lines @@
         verticalRule = SpaceImageRule;
         break;
     default: // CSSValueRepeat
         verticalRule = RepeatImageRule;
         break;
     }
     image.setVerticalRule(verticalRule);
 }
 
 };