Remove unused web_incremental_test (#86829)

diff --git a/dev/devicelab/bin/tasks/web_incremental_test.dart b/dev/devicelab/bin/tasks/web_incremental_test.dart
deleted file mode 100644
index 1a32cbd..0000000
--- a/dev/devicelab/bin/tasks/web_incremental_test.dart
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright 2014 The Flutter Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import 'package:flutter_devicelab/framework/framework.dart';
-import 'package:flutter_devicelab/tasks/web_dev_mode_tests.dart';
-
-Future<void> main() async {
-  await task(createWebDevModeTest(WebDevice.chrome, true));
-}