Cleanup: Start using toFoo methods as part of newly adopted coding guideline.

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 1093 matching lines @@
         color = svgColor->color();
     return color;
 }
 
 static EPaintOrder paintOrderFlattened(CSSValue* cssPaintOrder)
 {
     if (cssPaintOrder->isValueList()) {
         int paintOrder = 0;
         CSSValueListInspector iter(cssPaintOrder);
         for (size_t i = 0; i < iter.length(); i++) {
-            CSSPrimitiveValue* value = static_cast<CSSPrimitiveValue*>(iter.item(i));
+            CSSPrimitiveValue* value = toCSSPrimitiveValue(iter.item(i));
 
             EPaintOrderType paintOrderType = PT_NONE;
             switch (value->getValueID()) {
             case CSSValueFill:
                 paintOrderType = PT_FILL;
                 break;
             case CSSValueStroke:
                 paintOrderType = PT_STROKE;
                 break;
             case CSSValueMarkers:
@@ skipping 1260 matching lines @@
         break;
     }
     case CSSPropertyEnableBackground:
         // Silently ignoring this property for now
         // http://bugs.webkit.org/show_bug.cgi?id=6022
         break;
     }
 }
 
 } // namespace WebCore