function prototypeMethodOrNull(className, method) {
  var ctor = goog.global[className];
  return (ctor && ctor.prototype && ctor.prototype[method]) || null;
}
function prototypeMethodOrNull(className, method) {
  var ctor = goog.global[className];
  return (ctor && ctor.prototype && ctor.prototype[method]) || null;
}
function prototypeMethodOrNull ( className , method ) { var ctor = goog . global [ className ] ; return ( ctor && ctor . prototype && ctor . prototype [ method ] ) || null ; }
Shorthand for `DOMInterface.prototype.method` to improve readability
during initialization of `Methods`.
@param {string} className
@param {string} method
@return {?Function}
Shorthand for DOMInterface . prototype . method to improve readability during initialization of Methods .
Returns the prototype method of the given class or method.