Revert "Revert "Blob constructor""

lib/dom/dom.dart

Index: lib/dom/dom.dart
diff --git a/lib/dom/dom.dart b/lib/dom/dom.dart
index 6b7c9214cefb7cc3d2ed39e7834355840f4d107f..22fc847aecc59ed0546e692b9a27b0c63281d2ba 100644
--- a/lib/dom/dom.dart
+++ b/lib/dom/dom.dart
@@ -13,6 +13,13 @@
 // 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]) => _dummy();
+}
+// 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.
+
 class _DOMParserFactoryProvider {
   factory DOMParser() => _dummy();
 }
@@ -643,7 +650,9 @@ interface BiquadFilterNode extends AudioNode {
 
 // WARNING: Do not edit - generated code.
 
-interface Blob {
+interface Blob default _BlobFactoryProvider {
+
+  Blob(List blobParts, [String type, String endings]);
 
   final int size;