Make 'where' lazy.

sdk/lib/_internal/compiler/implementation/lib/interceptors.dart

Index: sdk/lib/_internal/compiler/implementation/lib/interceptors.dart
diff --git a/sdk/lib/_internal/compiler/implementation/lib/interceptors.dart b/sdk/lib/_internal/compiler/implementation/lib/interceptors.dart
index 27571d161f89e21fb39b7ff2bbd116caeb5aeaad..2579c95b3c12e56aa54d1488a36637bb5b546ef9 100644
--- a/sdk/lib/_internal/compiler/implementation/lib/interceptors.dart
+++ b/sdk/lib/_internal/compiler/implementation/lib/interceptors.dart
@@ -71,11 +71,11 @@ removeLast(var receiver) {
   return UNINTERCEPTED(receiver.removeLast());
 }
 
-filter(var receiver, var predicate) {
+where(var receiver, var predicate) {
   if (!isJsArray(receiver)) {
     return UNINTERCEPTED(receiver.where(predicate));
   } else {
-    return Collections.where(receiver, [], predicate);
+    return new FilteredIterable(receiver, predicate);
   }
 }