Replace static_cast with safe casting methods

Source/bindings/v8/custom/V8CSSValueCustom.cpp

 /*
  * Copyright (C) 2010 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 34 matching lines @@
 v8::Handle<v8::Object> wrap(CSSValue* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     ASSERT(impl);
     if (impl->isCSSTransformValue())
         return wrap(static_cast<CSSTransformValue*>(impl), creationContext, isolate);
     if (impl->isCSSMixFunctionValue())
         return wrap(static_cast<CSSMixFunctionValue*>(impl), creationContext, isolate);
     if (impl->isCSSFilterValue())
         return wrap(static_cast<CSSFilterValue*>(impl), creationContext, isolate);
     if (impl->isValueList())
-        return wrap(static_cast<CSSValueList*>(impl), creationContext, isolate);
+        return wrap(toCSSValueList(impl), creationContext, isolate);
     if (impl->isPrimitiveValue())
-        return wrap(static_cast<CSSPrimitiveValue*>(impl), creationContext, isolate);
+        return wrap(toCSSPrimitiveValue(impl), creationContext, isolate);
     if (impl->isSVGPaint())
         return wrap(static_cast<SVGPaint*>(impl), creationContext, isolate);
     if (impl->isSVGColor())
         return wrap(static_cast<SVGColor*>(impl), creationContext, isolate);
     return V8CSSValue::createWrapper(impl, creationContext, isolate);
 }
 
 } // namespace WebCore