Generate toCSSCalcValue() instead of using manual inline functions

Source/core/css/resolver/StyleBuilderCustom.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * 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, 2013 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.
@@ skipping 1189 matching lines @@
     return false;
 }
 
 static bool hasVariableReference(CSSValue* value)
 {
     if (value->isPrimitiveValue()) {
         CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
         return primitiveValue->hasVariableReference();
     }
 
-    if (value->isCalculationValue())
-        return static_cast<CSSCalcValue*>(value)->hasVariableReference();
+    if (value->isCalcValue())
+        return toCSSCalcValue(value)->hasVariableReference();
 
     if (value->isReflectValue()) {
         CSSReflectValue* reflectValue = toCSSReflectValue(value);
         CSSPrimitiveValue* direction = reflectValue->direction();
         CSSPrimitiveValue* offset = reflectValue->offset();
         CSSValue* mask = reflectValue->mask();
         return (direction && hasVariableReference(direction)) || (offset && hasVariableReference(offset)) || (mask && hasVariableReference(mask));
     }
 
     for (CSSValueListIterator i = value; i.hasMore(); i.advance()) {
@@ skipping 1174 matching lines @@
         break;
     }
     case CSSPropertyEnableBackground:
         // Silently ignoring this property for now
         // http://bugs.webkit.org/show_bug.cgi?id=6022
         break;
     }
 }
 
 } // namespace WebCore