fix super ctor logic

lib/runtime/dart/_interceptors.js

 var _interceptors;
 (function(exports) {
   'use strict';
   let JSArray = Array;
   let JSMutableArray$ = dart.generic(function(E) {
     class JSMutableArray extends JSArray$(E) {}
     JSMutableArray[dart.implements] = () => [JSMutableIndexable];
     return JSMutableArray;
   });
   let JSMutableArray = JSMutableArray$();
@@ skipping 838 matching lines @@
       if (dart.notNull(index) >= dart.notNull(this.length) || dart.notNull(index) < 0)
         throw new core.RangeError.value(index);
       return this[index];
     }
   }
   JSString[dart.implements] = () => [core.String, JSIndexable];
   let _string = Symbol('_string');
   class _CodeUnits extends _internal.UnmodifiableListBase$(core.int) {
     _CodeUnits(string) {
       this[_string] = string;
-      super.UnmodifiableListBase();
     }
     get [core.$length]() {
       return this[_string].length;
     }
     [core.$get](i) {
       return this[_string].codeUnitAt(i);
     }
   }
   // Function _symbolToString: (Symbol) → String
   function _symbolToString(symbol) {
@@ skipping 214 matching lines @@
   exports.findInterceptorForType = findInterceptorForType;
   exports.JSBool = JSBool;
   exports.JSNull = JSNull;
   exports.JSIndexable = JSIndexable;
   exports.JSMutableIndexable = JSMutableIndexable;
   exports.JSObject = JSObject;
   exports.JavaScriptObject = JavaScriptObject;
   exports.PlainJavaScriptObject = PlainJavaScriptObject;
   exports.UnknownJavaScriptObject = UnknownJavaScriptObject;
 })(_interceptors || (_interceptors = {}));