Generate toCSSFooValue() for CSSCanvasValue, CSSCrossfadeValue, CSSImageGeneratorValue, CSSImageVal…

Source/core/css/FontFace.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 428 matching lines @@
 #if ENABLE(SVG_FONTS)
             source->setSVGFontFaceElement(item->svgFontFaceElement());
 #endif
             cssFontFace->addSource(source.release());
         }
     }
 
     if (CSSValueList* rangeList = toCSSValueList(m_unicodeRange.get())) {
         unsigned numRanges = rangeList->length();
         for (unsigned i = 0; i < numRanges; i++) {
-            CSSUnicodeRangeValue* range = static_cast<CSSUnicodeRangeValue*>(rangeList->itemWithoutBoundsCheck(i));
+            CSSUnicodeRangeValue* range = toCSSUnicodeRangeValue(rangeList->itemWithoutBoundsCheck(i));
             cssFontFace->addRange(range->from(), range->to());
         }
     }
     return cssFontFace;
 }
 
 } // namespace WebCore