regenerate fixed custom_elements polyfill

tests/html/html.status

 # Copyright (c) 2013, 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.
 
 event_test: Skip  # Issue 1996
 interactive_test: Skip # Must be run manually.
 dromaeo_smoke_test: Skip # Issue 14521, 8257
 
 [ $compiler == dart2js && $csp ]
 custom/js_custom_test: Fail # Issue 14643
@@ skipping 49 matching lines @@
 rtc_test/supported: Fail # TODO(dart2js-team): Please triage this failure.
 speechrecognition_test/supported: Fail # TODO(dart2js-team): Please triage this failure.
 speechrecognition_test/types: Fail # TODO(dart2js-team): Please triage this failure.
 xhr_test/json: Fail # TODO(dart2js-team): Please triage this failure.
 
 
 [ $compiler == dart2js && $runtime == ie10 ]
 async_test: Pass, Fail # timers test fails on ie10.
 indexeddb_5_test: Fail # Issue 12893
 js_test: Fail # Issue 14246
-custom/constructor_calls_created_synchronously_test: Fail, Pass # Issue 16441
-custom_elements_test/innerHtml: Fail, Pass # Issue 16441
-custom_elements_test/lifecycle: Fail, Pass # Issue 16441
-custom_elements_test/mixins: Fail, Pass # Issue 16441
-custom/document_register_type_extensions_test/functional: Fail, Pass # Issue 16441
 
 [ $compiler == dart2js && ( $runtime == ie9 || $runtime == ie10 ) ]
 worker_api_test: Fail # IE does not support URL.createObjectURL in web workers.
 
 [ $runtime == chrome ]
 canvasrenderingcontext2d_test/drawImage_video_element: Pass,Fail # Issue 11836
 canvasrenderingcontext2d_test/drawImage_video_element_dataUrl: Pass,Fail # Issue 11836
 
 xhr_test: Pass, Fail # Issue 11884
 xhr_cross_origin_test: Pass, Fail # Issue 11884
@@ skipping 86 matching lines @@
 postmessage_structured_test: Skip   # BUG(5685): times out.
 serialized_script_value_test: Fail
 url_test: Fail              # IE9 does not support createObjectURL (it is supported in IE10)
 canvasrenderingcontext2d_test/drawImage_video_element: Fail # IE does not support drawImage w/ video element
 canvasrenderingcontext2d_test/drawImage_video_element_dataUrl: Fail # IE does not support drawImage w/ video element
 canvasrenderingcontext2d_test/drawImage_image_element: Pass, Fail # Issue: 11416
 input_element_test/attributes: Fail # IE returns null while others ''
 xhr_cross_origin_test: Skip # Issue 12920
 xhr_test/json: Fail # IE9 returns null because of unsupported type
 js_test: RuntimeError # Issue 14645
-custom/mirrors_test: pass, fail # Issue 16441
-custom/constructor_calls_created_synchronously_test: pass, fail # Issue 16441
-custom/document_register_basic_test: pass, fail # Issue 16441
-custom/js_custom_test: pass, fail # issue 16441
 
 # IE9 Feature support statuses-
 # All changes should be accompanied by platform support annotation changes.
 audiobuffersourcenode_test/supported: Fail
 audiocontext_test/supported: Fail
 cache_test/supported: Fail
 crypto_test/supported: Fail
 css_test/supportsPointConversions: Fail
 document_test/supports_cssCanvasContext: Fail
 element_types_test/supported_content: Fail
@@ skipping 214 matching lines @@
 events_test: StaticWarning
 htmlelement_test: StaticWarning
 localstorage_test: StaticWarning
 mutationobserver_test: StaticWarning
 track_element_constructor_test: StaticWarning
 transferables_test: StaticWarning
 typed_arrays_range_checks_test: StaticWarning
 typing_test: StaticWarning
 webgl_1_test: StaticWarning
 window_nosuchmethod_test: StaticWarning