fuse List and js Array together and a few other misc fixes.

lib/runtime/dart/collection.js

 var collection;
 (function(exports) {
   'use strict';
   let _source = Symbol('_source');
   let UnmodifiableListView$ = dart.generic(function(E) {
     class UnmodifiableListView extends _internal.UnmodifiableListBase$(E) {
       UnmodifiableListView(source) {
         this[_source] = source;
       }
       get [core.$length]() {
@@ skipping 1783 matching lines @@
               let x = index;
               index = dart.notNull(x) + 1;
               return x;
             })(), element);
           }
         }
       }
       get [core.$reversed]() {
         return new (_internal.ReversedListIterable$(E))(this);
       }
-      toString() {
+      [core.$toString]() {
         return IterableBase.iterableToFullString(this, '[', ']');
       }
     }
     ListMixin[dart.implements] = () => [core.List$(E)];
     return ListMixin;
   });
   let ListMixin = ListMixin$();
   let ListBase$ = dart.generic(function(E) {
     class ListBase extends dart.mixin(core.Object, ListMixin$(E)) {
       static listToString(list) {
@@ skipping 3192 matching lines @@
   exports.LinkedHashMapKeyIterable$ = LinkedHashMapKeyIterable$;
   exports.LinkedHashMapKeyIterable = LinkedHashMapKeyIterable;
   exports.LinkedHashMapKeyIterator$ = LinkedHashMapKeyIterator$;
   exports.LinkedHashMapKeyIterator = LinkedHashMapKeyIterator;
   exports.HashSetIterator$ = HashSetIterator$;
   exports.HashSetIterator = HashSetIterator;
   exports.LinkedHashSetCell = LinkedHashSetCell;
   exports.LinkedHashSetIterator$ = LinkedHashSetIterator$;
   exports.LinkedHashSetIterator = LinkedHashSetIterator;
 })(collection || (collection = {}));