_base.js
function closureRequire(symbol) {
  closure.goog.require(symbol);
  return closure.goog.getObjectByName(symbol);
}
function closureRequire(symbol) {
  closure.goog.require(symbol);
  return closure.goog.getObjectByName(symbol);
}
function closureRequire ( symbol ) { closure . goog . require ( symbol ) ; return closure . goog . getObjectByName ( symbol ) ; }
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.
Loads a symbol by name from the protected Closure context .