Remove CSS clients of ImageResource

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 402 matching lines @@
     // Set the image (this kicks off the load).
     CSSPropertyID imageProperty;
     if (property == CSSPropertyWebkitBorderImage)
         imageProperty = CSSPropertyBorderImageSource;
     else
         imageProperty = property;
 
     for (unsigned i = 0 ; i < borderImage->length() ; ++i) {
         CSSValue* current = borderImage->item(i);
 
-        if (current->isImageValue() || current->isImageGeneratorValue() || current->isImageSetValue())
+        if (current->isImageGeneratorValue())
             image.setImage(styleImage(imageProperty, current));
         else if (current->isBorderImageSliceValue())
             mapNinePieceImageSlice(current, image);
         else if (current->isValueList()) {
             CSSValueList* slashList = toCSSValueList(current);
             size_t length = slashList->length();
             // Map in the image slices.
             if (length && slashList->item(0)->isBorderImageSliceValue())
                 mapNinePieceImageSlice(slashList->item(0), image);
 
@@ skipping 126 matching lines @@
         verticalRule = SpaceImageRule;
         break;
     default: // CSSValueRepeat
         verticalRule = RepeatImageRule;
         break;
     }
     image.setVerticalRule(verticalRule);
 }
 
 };