code: function closureRequire(symbol) {
    closure.goog.require(symbol);
    return closure.goog.getObjectByName(symbol);
  }
docs: Loads a symbol by name from the protected Closure context.
  @param {string} symbol The symbol to load.
  @return {?} The loaded symbol, or {@code null} if not found.
  @throws {Error} If the symbol has not been defined.