message: Fix bug where a string constant with a space can get word
  wrapped in the generated code.
diff: @@ -395,6 +395,9 @@ string AttrListToPython(const AttrValue& value,
  return ret;
  }
  +// NOTE: The return value may contain spaces (for example, it could be
  +// a string "foo bar" with an embedded space) and is not safe to pass
  +// to WordWrap().
  string AttrValueToPython(const string& type, const AttrValue& value,
  const string& dtype_module) {
  if (type == "string") {
  @@ -528,9 +531,7 @@ string GenPythonOp::Code() {
  }
  void GenPythonOp::AddDefLine(const string& parameters) {
  - const string def_prefix = strings::StrCat("def ", function_name_, "(");
  - strings::StrAppend(
  - &result_, WordWrap(def_prefix, parameters + "):", kRightMargin), "\n");
  + strings::StrAppend(&result_, "def ", function_name_, "(", parameters, "):\n");
  }
  void GenPythonOp::AddDocStringDescription() {
  