Fix node_validator xss tests for IE and Firefox

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.
 
 interactive_test: Skip # Must be run manually.
 dromaeo_smoke_test: Skip # Issue 14521, 8257
 cross_frame_test: Skip # Test reloads itself. Issue 18558
 
 js_array_test: Skip # Issue 23676, 23677
 js_typed_interop_test: Skip # Issue 23676, 23677
@@ skipping 190 matching lines @@
 transferables_test: Fail # Issue 9846
 
 [ $compiler == dart2js && $minified ]
 canvas_pixel_array_type_alias_test/types2_runtimeTypeName: Fail, OK # Issue 12605
 
 [ $compiler == dart2js && $runtime == chrome ]
 css_test/supportsPointConversions: Fail # Issues 21710
 css_test/functional: Fail # Issues 21710
 
 [ $runtime == ie11 ]
-node_validator_important_if_you_suppress_make_the_bug_critical_test/dom_clobbering: RuntimeError # Issue 24387
 custom/document_register_type_extensions_test/single-parameter: Fail # Issue 13193.
 canvasrenderingcontext2d_test/arc: Pass, Fail # Pixel unexpected value. Please triage this failure.
 worker_test/functional: Pass, Fail # Issues 20659.
 transferables_test: Pass, Fail # Issues 20659.
 
 # IE11 Feature support statuses-
 # These results not yet noted in platform support annotations.
 # All changes should be accompanied by platform support annotation changes.
 audiobuffersourcenode_test/supported: Fail
 audiocontext_test/supported: Fail
@@ skipping 122 matching lines @@
 document_test/supports_cssCanvasContext: Fail
 element_types_test/supported_template: Fail
 indexeddb_1_test/supported: Fail
 indexeddb_1_test/supportsDatabaseNames: Fail
 mutationobserver_test/supported: Fail
 performance_api_test/supported: Fail
 speechrecognition_test/supported: Fail
 websql_test/supported: Fail
 
 [  $compiler == dart2js && $runtime == ff ]
-node_validator_important_if_you_suppress_make_the_bug_critical_test/DOM_sanitization: RuntimeError # Issue 24384
 history_test/history: Skip # Issue 22050
 xhr_test/xhr: Pass, Fail # Issue 11602
 dart_object_local_storage_test: Skip  # sessionStorage NS_ERROR_DOM_NOT_SUPPORTED_ERR
 webgl_1_test: Pass, Fail   # Issue 8219
 canvasrenderingcontext2d_test/drawImage_video_element_dataUrl: Pass, Fail # Firefox pre-38 does not like dataUrl videos for drawImage Issue 23479
 text_event_test: Fail # Issue 17893
 
 # Firefox Feature support statuses-
 # All changes should be accompanied by platform support annotation changes.
 document_test/supports_cssCanvasContext: Fail
@@ skipping 55 matching lines @@
 queryall_test: fail
 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
 
 [ $compiler == dart2js && $cps_ir ]
 resource_http_test: Crash # (await for(var b in r.openRead()){bytes.addAll(b);}): await for