Revert "Blob constructor"

lib/html/dartium/html_dartium.dart

Index: lib/html/dartium/html_dartium.dart
diff --git a/lib/html/dartium/html_dartium.dart b/lib/html/dartium/html_dartium.dart
index 531b3558ba14d56dc4cc1a9351838d18d65c299f..a028ffcc44cb469ddfe5db40fb34c6dc5033ac4a 100644
--- a/lib/html/dartium/html_dartium.dart
+++ b/lib/html/dartium/html_dartium.dart
@@ -646,14 +646,6 @@ class _BiquadFilterNodeImpl extends _AudioNodeImpl implements BiquadFilterNode {
 // 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 _BlobFactoryProvider {
-  factory Blob(List blobParts, [String type = null, String endings = null]) => _createBlob(blobParts, type, endings);
-  static Blob _createBlob(List blobParts, [String type = null, String endings = null]) native "Blob_constructor_Callback";
-}
-// 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.
-
 // WARNING: Do not edit - generated code.
 
 class _BlobImpl extends NativeFieldWrapperClass1 implements Blob {
@@ -22318,9 +22310,7 @@ interface BiquadFilterNode extends AudioNode {
 // WARNING: Do not edit - generated code.
 
 /// @domName Blob
-interface Blob default _BlobFactoryProvider {
-
-  Blob(List blobParts, [String type, String endings]);
+interface Blob {
 
   /** @domName Blob.size */
   final int size;