Remove unset clientFuture (#2718)

Use `client` field instead. See 382ff42#r171048941.

- Thanks for your contribution! Please replace this text with a description of what this PR is changing or adding and why, list any relevant issues, and review the contribution guidelines below.

---

<details>
  <summary>Contribution guidelines:</summary><br>

- See our [contributor guide](https://github.com/dart-lang/.github/blob/main/CONTRIBUTING.md) for general expectations for PRs.
- Larger or significant changes should be discussed in an issue before creating a PR.
- Contributions to our repos should follow the [Dart style guide](https://dart.dev/guides/language/effective-dart) and use `dart format`.
- Most changes should add an entry to the changelog and may need to [rev the pubspec package version](https://github.com/dart-lang/sdk/blob/main/docs/External-Package-Maintenance.md#making-a-change).
- Changes to packages require [corresponding tests](https://github.com/dart-lang/.github/blob/main/CONTRIBUTING.md#Testing).

Many Dart repos have a weekly cadence for reviewing PRs - please allow for some latency before initial review feedback.

**Note**: The Dart team is trialing Gemini Code Assist. Don't take its comments as final Dart team feedback. Use the suggestions if they're helpful; otherwise, wait for a human reviewer.

</details>

Author: iinozemtsev

dwds/CHANGELOG.md

@@ -1,6 +1,7 @@
 ## 26.2.3-wip
 
 - Bump `build_web_compilers` to ^4.4.1.
+- Remove unused `clientFuture` arg from `DwdsVmClient` methods.
 
 ## 26.2.2
 

dwds/lib/src/dwds_vm_client.dart

@@ -134,14 +134,12 @@ abstract base class DwdsVmClient<
     required Stream<VmRequest> requestStream,
     required StreamSink<VmRequest> requestSink,
     DwdsStats? dwdsStats,
-    Future<VmService>? clientFuture,
   }) {
     responseStream.listen((request) async {
       final response = await _maybeHandleServiceExtensionRequest(
         request,
         proxyService: proxyService,
         dwdsStats: dwdsStats,
-        clientFuture: clientFuture,
       );
       if (response != null) {
         requestSink.add(response);
@@ -169,13 +167,11 @@ abstract base class DwdsVmClient<
     VmResponse request, {
     required T proxyService,
     required DwdsStats? dwdsStats,
-    required Future<VmService>? clientFuture,
   }) async {
     final response = await maybeHandleServiceExtensionRequestImpl(
       request,
       proxyService: proxyService,
       dwdsStats: dwdsStats,
-      clientFuture: clientFuture,
     );
     if (response != null) {
       response['id'] = request['id'] as String;
@@ -192,7 +188,6 @@ abstract base class DwdsVmClient<
     VmResponse request, {
     required T proxyService,
     DwdsStats? dwdsStats,
-    Future<VmService>? clientFuture,
   });
 
   @mustBeOverridden
@@ -351,7 +346,6 @@ final class ChromeDwdsVmClient
     VmResponse request, {
     required ChromeProxyService proxyService,
     DwdsStats? dwdsStats,
-    Future<VmService>? clientFuture,
   }) async {
     VmRequest? response;
     final method = request['method'];
@@ -362,8 +356,7 @@ final class ChromeDwdsVmClient
     } else if (method == _NamespacedServiceExtension.extDwdsReload.method) {
       response = await _extDwdsReloadHandler(proxyService);
     } else if (method == _NamespacedServiceExtension.extDwdsRestart.method) {
-      final client = await clientFuture;
-      response = await _extDwdsRestartHandler(proxyService, client!);
+      response = await _extDwdsRestartHandler(proxyService, client);
     } else if (method == _NamespacedServiceExtension.extDwdsSendEvent.method) {
       response = await extDwdsSendEventHandler(request, dwdsStats, logger);
     } else if (method == _NamespacedServiceExtension.extDwdsScreenshot.method) {
@@ -638,7 +631,6 @@ final class WebSocketDwdsVmClient
     VmResponse request, {
     required WebSocketProxyService proxyService,
     DwdsStats? dwdsStats,
-    Future<void>? clientFuture,
   }) async {
     VmRequest? response;
     final method = request['method'];