Move dart:dom implementation classes to dart:html library.

lib/dom/templates/dom/native/dart_implementation.darttemplate

Index: lib/dom/templates/dom/native/dart_implementation.darttemplate
diff --git a/lib/dom/templates/dom/native/dart_implementation.darttemplate b/lib/dom/templates/dom/native/dart_implementation.darttemplate
index 62a255d3aa76870c4dc3865c7b97f4f14b1473d7..c4422b49aa7418965509bcdab0d8df0e105f93ca 100644
--- a/lib/dom/templates/dom/native/dart_implementation.darttemplate
+++ b/lib/dom/templates/dom/native/dart_implementation.darttemplate
@@ -4,9 +4,15 @@
 
 // WARNING: Do not edit - generated code.
 
-class $CLASS extends $BASE implements $INTERFACE {
-  static $CLASS _create$CLASS() => new $CLASS._create$CLASS();
+interface _$INTERFACE {
+}
+
+class $CLASS extends $BASE implements _$INTERFACE {
   $CLASS._create$CLASS();
   String get typeName() => "$INTERFACE";
 $MEMBERS
 }
+
+_create$CLASS() => new $CLASS._create$CLASS();
+
+_is$CLASS(object) => object is $CLASS;