Get rid of DOMWrapperBase and DOMTypeBase.

lib/html/src/_DOMTypeBase.dart

Index: lib/html/src/_DOMTypeBase.dart
diff --git a/lib/html/src/_DOMTypeBase.dart b/lib/html/src/_DOMTypeBase.dart
deleted file mode 100644
index 85e4b2e0167da12b347dda50c7371b5b37ba688e..0000000000000000000000000000000000000000
--- a/lib/html/src/_DOMTypeBase.dart
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright (c) 2011, 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.
-
-class _DOMTypeBase {
-  final _ptr;
-
-  _DOMTypeBase._wrap(this._ptr) {
-  	// We should never be creating duplicate wrappers.
-  	// TODO(jacobr): this boolean value is evaluated outside of the assert
-  	// to work around a mysterious and flaky bug in tip of trunk versions of
-  	// chrome.
-  	bool hasExistingWrapper = _ptr.dartObjectLocalStorage === null;
-  	assert(hasExistingWrapper);
-	  _ptr.dartObjectLocalStorage = this;
-  }
-}
-
-/** This function is provided for unittest purposes only. */
-unwrapDomObject(_DOMTypeBase wrapper) {
-  return wrapper._ptr;
-}