Removing noSuchMethod from Element.

tests/html/html.status

Index: tests/html/html.status
diff --git a/tests/html/html.status b/tests/html/html.status
index 50454849586a64f69c21297e546b89c396f4f8e3..072ee89d75b6cde95d4f057508e2c4d5c6697c2f 100644
--- a/tests/html/html.status
+++ b/tests/html/html.status
@@ -56,7 +56,6 @@ documentfragment_test: Pass, Timeout
 # TODO(vsm): Triage DOM tests.
 shadow_dom_test: Skip # No ShadowDOM support except on tip dartium.
 shadow_dom_layout_test: Skip
-unknownelement_test: Fail # Issue 4189
 
 [ $runtime == dartium || $runtime == chrome || $runtime == ie9 || $runtime == ie10 || $runtime == safari || $runtime == ff || $runtime == opera ]
 history_test: Fail
@@ -275,12 +274,6 @@ xhr_test: Fail
 [ $runtime == vm ]
 *: Skip
 
-# TODO(jmesserly): now that we have a bot, we need to set up Opera testing.
-
-[ $compiler == dart2js && $runtime == drt ]
-# Unknown error - should investigate.
-unknownelement_test: Fail # Issue 4189
-
 [ $compiler == dart2js ]
 transferables_test: Skip # until isInstance works in dart2js