Removing HTML elements by making them private.

sdk/lib/html/dart2js/html_dart2js.dart

 library html;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:html_common';
 import 'dart:indexed_db';
 import 'dart:isolate';
 import 'dart:json' as json;
 import 'dart:math';
 import 'dart:svg' as svg;
@@ skipping 5509 matching lines @@
   final num gamma;
 
   /// @domName DeviceOrientationEvent.initDeviceOrientationEvent; @docsEditable true
   void initDeviceOrientationEvent(String type, bool bubbles, bool cancelable, num alpha, num beta, num gamma, bool absolute) native;
 }
 // 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.
 
 
-/// @domName HTMLDirectoryElement; @docsEditable true
-class DirectoryElement extends Element native "*HTMLDirectoryElement" {
-
-  /// @domName HTMLDirectoryElement.compact; @docsEditable true
-  bool compact;
-}
-// 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.
-
-
 /// @domName DirectoryEntry; @docsEditable true
 class DirectoryEntry extends Entry native "*DirectoryEntry" {
 
   /// @domName DirectoryEntry.createReader; @docsEditable true
   DirectoryReader createReader() native;
 
   /// @domName DirectoryEntry.getDirectory; @docsEditable true
   void getDirectory(String path, {Map options, EntryCallback successCallback, ErrorCallback errorCallback}) {
     if (?errorCallback) {
       var options_1 = convertDartToNative_Dictionary(options);
@@ skipping 18065 matching lines @@
   // -- end List<CssValue> mixins.
 
   /// @domName CSSValueList.item; @docsEditable true
   CssValue item(int index) native;
 }
 // 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.
 
 
+/// @domName HTMLDirectoryElement; @docsEditable true
+class _DirectoryElement extends Element native "*HTMLDirectoryElement" {
+}
+// 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.
+
+
 /// @domName EntryArray; @docsEditable true
 class _EntryArray implements JavaScriptIndexingBehavior, List<Entry> native "*EntryArray" {
 
   /// @domName EntryArray.length; @docsEditable true
   int get length => JS("int", "#.length", this);
 
   Entry operator[](int index) => JS("Entry", "#[#]", this, index);
 
   void operator[]=(int index, Entry value) {
     throw new UnsupportedError("Cannot assign element of immutable List.");
@@ skipping 4343 matching lines @@
       _position = nextPosition;
       return true;
     }
     _current = null;
     _position = _array.length;
     return false;
   }
 
   T get current => _current;
 }