MOZ_DECL_CTOR_COUNTER(nsCSSValue::URL)
MOZ_DECL_CTOR_COUNTER(nsCSSValue::Image)
  MOZ_DECL_CTOR_COUNTER(nsCSSValue::URL)  struct URL {    // Caller must delete this object immediately if the allocation of    // |mString| fails.    URL(nsIURI* aURI, const PRUnichar* aString)      : mURI(aURI),        mString(nsCRT::strdup(aString)),        mRefCnt(0)    {      MOZ_COUNT_CTOR(nsCSSValue::URL);    }