inline nsString& nsCSSValue::GetStringValue(nsString& aBuffer) const
inline nsAWritableString& nsCSSValue::GetStringValue(nsAWritableString& aBuffer) const
inline nsString& nsCSSValue::GetStringValue(nsString& aBuffer) const{  NS_ASSERTION((eCSSUnit_String <= mUnit) && (mUnit <= eCSSUnit_Counters), "not a string value");  aBuffer.Truncate();  if ((eCSSUnit_String <= mUnit) && (mUnit <= eCSSUnit_Counters) &&       (nsnull != mValue.mString)) {    aBuffer.Append(mValue.mString);  }  return aBuffer;}