Removed DARTIUM codegen for IDLS (sdk/lib/dartium)

tools/dom/templates/html/impl/impl_HashChangeEvent.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.
 
 // WARNING: Do not edit - generated code.
 
 part of $LIBRARYNAME;
 $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
   factory $CLASSNAME(String type,
       {bool canBubble: true, bool cancelable: true, String oldUrl,
       String newUrl}) {
     var options = {
       'canBubble' : canBubble,
       'cancelable' : cancelable,
       'oldURL': oldUrl,
       'newURL': newUrl,
     };
-$if DART2JS
     return JS('HashChangeEvent', 'new HashChangeEvent(#, #)',
         type, convertDartToNative_Dictionary(options));
-$else
-    return _blink.BlinkHashChangeEvent.instance
-        .constructorCallback_2_(type, convertDartToNative_Dictionary(options));
-$endif
   }
 
 $!MEMBERS
 }