Treat EventTarget as a secondary superclass

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.
 
 async_window_test: Skip #TODO(gram): investigating
 event_test: Skip  # Issue 1996
 interactive_test: Skip # Must be run manually.
 
 # Issue 9326
 custom_elements_test/register: Fail
 custom_elements_test/preregister: Fail
 
 [ $compiler == dart2js ]
 # Document.register is unimplemented.
 custom_elements_test: Skip
 
 [ $compiler == dartanalyzer || $compiler == dart2analyzer ]
 # Document.register is unimplemented.
 custom_elements_test: Skip
 
 [ $compiler == none && ($runtime == drt || $runtime == dartium) && $mode == debug && $system == macos]
 audiobuffersourcenode_test: Pass, Fail, Crash # http://crbug.com/256601
 
 [ $compiler == none && ($runtime == drt || $runtime == dartium) ]
 # postMessage in dartium always transfers the typed array buffer, never a view
 postmessage_structured_test/typed_arrays: Fail
 # TODO(vsm): Triage from latest Blink merge
-indexeddb_1_test: Skip
 indexeddb_2_test: Skip
 indexeddb_3_test: Skip
 indexeddb_4_test: Skip
 indexeddb_5_test: Skip
 js_test: Skip
-js_interop_2_test: Skip
 js_interop_4_test: Skip
-xhr_test: Skip
 crypto_test: Skip
 notifications_test: Skip
 dromaeo_smoke_test: Skip
 native_gc_test: Skip
-location_test: Skip
-history_test: Skip
-postmessage_structured_test: Skip # Timing out
-form_data_test: Skip # Timing out
 
 [ $compiler == none && $runtime == drt && $system == windows ]
 worker_test/functional: Pass, Crash # Issue 9929.
 
 [ $compiler == dart2js && $checked ]
 template_element_test: Fail # BUG(11480): Triage.
 
 [ $compiler == dart2js && ($runtime == ie9 || $runtime == ie10 || $runtime == safari || $runtime == ff || $runtime == chrome || $runtime == chromeOnAndroid || $runtime == opera || $runtime == drt || $runtime == dartium)]
 dom_isolates_test: Skip # Need to migrate to new spawnDomFunction.
 
@@ skipping 351 matching lines @@
 [ $compiler == dart2js && $csp && ($runtime == drt || $runtime == safari || $runtime == ff || $runtime == chrome || $runtime == chromeOnAndroid) ]
 # Note: these tests are all injecting scripts by design.  This is not allowed under CSP.
 event_customevent_test: Fail       # Test cannot run under CSP restrictions.
 js_interop_1_test: Skip            # Test cannot run under CSP restrictions (times out).
 js_interop_2_test: Fail, OK        # Test cannot run under CSP restrictions.
 js_interop_3_test: Skip            # Test cannot run under CSP restrictions (times out).
 js_test: Skip                      # Test cannot run under CSP restrictions (times out).
 postmessage_structured_test: Skip  # Test cannot run under CSP restrictions (times out).
 safe_dom_test: Skip                # Test cannot run under CSP restrictions (times out).
 shadow_dom_layout_test: Fail, OK   # Test cannot run under CSP restrictions.