Revert "Fixing SelectElement.selectedOptions to work across all platforms."

lib/html/templates/html/impl/impl_SelectElement.darttemplate

Index: lib/html/templates/html/impl/impl_SelectElement.darttemplate
diff --git a/lib/html/templates/html/impl/impl_SelectElement.darttemplate b/lib/html/templates/html/impl/impl_SelectElement.darttemplate
deleted file mode 100644
index 59635205dd7ce306ca1326e5ab8fa1a0a17f014f..0000000000000000000000000000000000000000
--- a/lib/html/templates/html/impl/impl_SelectElement.darttemplate
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright (c) 2012, 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.
-
-class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
-$!MEMBERS
-
-  List<OptionElement> get selectedOptions() {
-    return this.options.filter((o) => o.selected);
-  }
-}