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

Source/core/css/FontFace.cpp

Index: Source/core/css/FontFace.cpp
diff --git a/Source/core/css/FontFace.cpp b/Source/core/css/FontFace.cpp
index 947d935b09b6baa62b70b2fcb50c4c958abc80e6..0e92893a19a97eae62d3d4bf14faa529be5e498b 100644
--- a/Source/core/css/FontFace.cpp
+++ b/Source/core/css/FontFace.cpp
@@ -446,7 +446,7 @@ PassRefPtr<CSSFontFace> FontFace::createCSSFontFace(Document* document)
     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());
         }
     }