Set the raw string without verification or escaping.

def SetRaw(self, name, value):
    """Set the raw string without verification or escaping."""
    if self.writeback is None:
      logging.warning("Attempting to modify a read only config object.")
    if name in self.constants:
      raise ConstModificationError(
          "Attempting to modify constant value %s" % name)

    self.writeback_data[name] = value
    self.FlushCache()