Use type cast macro for AnimatableLengthPoint|3D instead of manual toFoo()

Source/core/css/parser/CSSPropertyParser.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 3428 matching lines @@
 
     // At least template-areas strings must be defined.
     if (!m_valueList->current())
         return false;
 
     while (m_valueList->current()) {
         // Handle leading <custom-ident>*.
         if (m_valueList->current()->unit == CSSParserValue::ValueList) {
             if (trailingIdentWasAdded) {
                 // A row's trailing ident must be concatenated with the next row's leading one.
-                parseGridLineNames(*m_valueList, *templateRows, static_cast<CSSGridLineNamesValue*>(templateRows->item(templateRows->length() - 1)));
+                parseGridLineNames(*m_valueList, *templateRows, toCSSGridLineNamesValue(templateRows->item(templateRows->length() - 1)));
             } else {
                 parseGridLineNames(*m_valueList, *templateRows);
             }
         }
 
         // Handle a template-area's row.
         if (!parseGridTemplateAreasRow(gridAreaMap, rowCount, columnCount))
             return false;
         ++rowCount;
 
@@ skipping 5048 matching lines @@
         parsedValues->append(CSSPrimitiveValue::createIdentifier(CSSValueFill));
     if (!seenStroke)
         parsedValues->append(CSSPrimitiveValue::createIdentifier(CSSValueStroke));
     if (!seenMarkers)
         parsedValues->append(CSSPrimitiveValue::createIdentifier(CSSValueMarkers));
 
     return parsedValues.release();
 }
 
 } // namespace WebCore