void SetString(const nsAString& aString)
void SetString(const nsACString& aString)
  void SetString(const nsAString& aString)  {    Reset();    mValue.mString = ToNewUnicode(aString);    if (mValue.mString) {      mType = CSS_STRING;    } else {      // XXXcaa We should probably let the caller know we are out of memory      mType = CSS_UNKNOWN;    }  }