Support JS$ prefix for dart and fix bug where _operator_getter and the [] operator were used incons…

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

 // 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.
 
 part of $LIBRARYNAME;
 
 $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
 
   static const String INDEX_SIZE = 'IndexSizeError';
   static const String HIERARCHY_REQUEST = 'HierarchyRequestError';
@@ skipping 34 matching lines @@
   String _message;
 
   // To suppress missing implicit constructor warnings.
   factory DomException._() { throw new UnsupportedError("Not supported"); }
 
   @Deprecated("Internal Use Only")
   static DomException internalCreateDomException() {
     return new DomException._internalWrap();
   }
 
-  @Deprecated("Internal Use Only")
-  js.JsObject blink_jsObject;
-
-  factory DomException._internalWrap() {
-    return new DomException.internal_();
-  }
+  external factory DomException._internalWrap();
 
   @Deprecated("Internal Use Only")
   DomException.internal_() { }
 
   @Deprecated("Internal Use Only")
   DomException.jsInterop(String m) {
     var name_index = m.indexOf(': ');
     if (name_index < 0) {
       _name = "";
       _message = m;
@@ skipping 17 matching lines @@
 
 $else
 $!MEMBERS
 $endif
 $if DART2JS
   @DomName('DOMException.toString')
   @DocsEditable()
   String toString() => JS('String', 'String(#)', this);
 $endif
 }