Make OptionElement construtor arguments named optional parameters.

tools/dom/templates/html/impl/impl_HTMLOptionElement.darttemplate

Index: tools/dom/templates/html/impl/impl_HTMLOptionElement.darttemplate
diff --git a/tools/dom/templates/html/dart2js/impl_SpeechRecognition.darttemplate b/tools/dom/templates/html/impl/impl_HTMLOptionElement.darttemplate
similarity index 66%
copy from tools/dom/templates/html/dart2js/impl_SpeechRecognition.darttemplate
copy to tools/dom/templates/html/impl/impl_HTMLOptionElement.darttemplate
index 4ca86263640d14ae4b4cedfeffc4daa3f40a2f6d..b40c7beca799b3844f5f81b7ab8fc3fbaedda85b 100644
--- a/tools/dom/templates/html/dart2js/impl_SpeechRecognition.darttemplate
+++ b/tools/dom/templates/html/impl/impl_HTMLOptionElement.darttemplate
@@ -5,9 +5,9 @@
 part of $LIBRARYNAME;
 
 $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
-$!MEMBERS
-  factory SpeechRecognition() {
-    return JS('SpeechRecognition',
-        'new (window.SpeechRecognition || window.webkitSpeechRecognition)()');
+  factory OptionElement({String data, String value, bool defaultSelected, 
+      bool selected}) {
+    return new OptionElement._(data, value, defaultSelected, selected);
   }
+$!MEMBERS
 }