Consumes a string value.

    Returns:
      The string parsed.

    Raises:
      ParseError: If a string value couldn't be consumed.

def ConsumeString(self):
    """Consumes a string value.

    Returns:
      The string parsed.

    Raises:
      ParseError: If a string value couldn't be consumed.
    """
    the_bytes = self.ConsumeByteString()
    try:
      return six.text_type(the_bytes, 'utf-8')
    except UnicodeDecodeError as e:
      raise self._StringParseError(e)