Fix runtime strong mode error in ListMixin

pkg/dev_compiler/test/browser/language_tests.js

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 define(['dart_sdk', 'async_helper', 'expect', 'unittest', 'is', 'require'],
       function(dart_sdk, async_helper, expect, unittest, is, require) {
   'use strict';
 
   async_helper = async_helper.async_helper;
   let minitest = expect.minitest;
@@ skipping 381 matching lines @@
       'list_insert_test': fail,
       'list_removeat_test': fail,
       'set_test': fail, // runtime strong mode reject
     },
 
     'corelib/regexp': {
       'default_arguments_test': fail,
       'UC16_test': firefox_fail,
     },
 
+    'lib/collection': {
+    },
+
     'lib/convert': {
       'encoding_test': skip_timeout,
 
       // TODO(jmesserly): this is in an inconsistent state between our old and
       // newer SDKs.
       'html_escape_test': ['skip'],
 
       'json_utf8_chunk_test': skip_timeout,
       'latin1_test': skip_timeout,
 
@@ skipping 427 matching lines @@
 
     for (let action of unittest_tests) {
       try {
         action();
       } catch (e) {
         console.error("Caught error tying to setup test:", e);
       }
     }
   });
 });