Update video_player_web to point to new video_player_interface (flutter#3536)

Author: Hixie

packages/video_player/video_player_web/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.0.0-nullsafety.3
+
+* Updated to video_player_platform_interface 4.0.
+
 ## 2.0.0-nullsafety.2
 
 * Fixed an issue where `isBuffering` was not updating on Web.

packages/video_player/video_player_web/pubspec.yaml

@@ -1,7 +1,7 @@
 name: video_player_web
 description: Web platform implementation of video_player.
 homepage: https://github.com/flutter/plugins/tree/master/packages/video_player/video_player_web
-version: 2.0.0-nullsafety.2
+version: 2.0.0-nullsafety.3
 
 flutter:
   plugin:
@@ -16,13 +16,11 @@ dependencies:
   flutter_web_plugins:
     sdk: flutter
   meta: ^1.3.0-nullsafety.3
-  video_player_platform_interface: ^3.0.0-nullsafety.3
+  video_player_platform_interface: ^4.0.0-nullsafety.0
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  video_player:
-    path: ../video_player
   pedantic: ^1.10.0-nullsafety.1
 
 environment:

packages/video_player/video_player_web/test/video_player_web_test.dart

@@ -1,14 +1,14 @@
 // Copyright 2019 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
+
 @TestOn('browser')
 
 import 'dart:async';
 
 import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:video_player/video_player.dart';
 import 'package:video_player_platform_interface/video_player_platform_interface.dart';
 import 'package:video_player_web/video_player_web.dart';