function SanitizedCssSubclass(content) {
  // IMPORTANT! No superclass chaining to avoid exception being thrown.
  this.content = content;
  this.contentKind = goog.soy.data.SanitizedContentKind.CSS;
}
Instantiable subclass of SanitizedCss.
@param {string} content
@constructor
@extends {goog.soy.data.SanitizedCss}