fix(ListWrapper): fix JS ListWrapper.remove()

Author: vicb

modules/facade/src/collection.dart

@@ -101,9 +101,7 @@ class ListWrapper {
  list.remove(items[i]);
  }
  }
- static remove(List list, item) {
- list.remove(item);
- }
+ static bool remove(List list, item) => list.remove(item);
  static void clear(List l) { l.clear(); }
  static String join(List l, String s) => l.join(s);
  static bool isEmpty(list) => list.isEmpty;

modules/facade/src/collection.es6

@@ -149,9 +149,13 @@ export class ListWrapper {
  list.splice(index, 1);
  }
  }
- static remove(list, item) {
- var index = list.indexOf(item);
- list.splice(index, 1);
+ static remove(list, el): boolean {
+ var index = list.indexOf(el);
+ if (index > -1) {
+ list.splice(index, 1);
+ return true;
+ }
+ return false;
  }
  static clear(list) {
  list.splice(0, list.length);