Remove stale files from lib/html/src.

lib/html/src/StorageEvent.dart

Index: lib/html/src/StorageEvent.dart
diff --git a/lib/html/src/StorageEvent.dart b/lib/html/src/StorageEvent.dart
deleted file mode 100644
index f650fcd83b87ceb74604a278daed54c8d15ed26e..0000000000000000000000000000000000000000
--- a/lib/html/src/StorageEvent.dart
+++ /dev/null
@@ -1,19 +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.
-
-interface StorageEvent extends Event default StorageEventWrappingImplementation {
-
-  StorageEvent(String type, String key, String url, Storage storageArea,
-      [bool canBubble, bool cancelable, String oldValue, String newValue]);
-
-  String get key();
-
-  String get newValue();
-
-  String get oldValue();
-
-  Storage get storageArea();
-
-  String get url();
-}