Adding missing license headers (#1735)

Author: brianquinlan

pkgs/http_client_conformance_tests/example/client_test.dart

@@ -1,3 +1,7 @@
+// Copyright (c) 2025, 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.
+
 import 'package:http/http.dart';
 import 'package:http_client_conformance_tests/http_client_conformance_tests.dart';
 import 'package:test/test.dart';

pkgs/http_client_conformance_tests/lib/src/dummy_isolate.dart

@@ -1,3 +1,7 @@
+// Copyright (c) 2025, 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.
+
 import 'dart:async';
 
 // ignore: avoid_classes_with_only_static_members

pkgs/http_parser/test/example_test.dart

@@ -1,3 +1,7 @@
+// Copyright (c) 2025, 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.
+
 import 'dart:io';
 
 import 'package:test/test.dart';

pkgs/http_profile/lib/http_profile.dart

@@ -1 +1,5 @@
+// Copyright (c) 2025, 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.
+
 export 'src/http_profile.dart';

pkgs/web_socket/example/web_socket_example.dart

@@ -1,3 +1,7 @@
+// Copyright (c) 2025, 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.
+
 import 'dart:convert';
 import 'dart:io';
 

pkgs/web_socket/lib/testing.dart

@@ -1 +1,5 @@
+// Copyright (c) 2025, 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.
+
 export 'src/fake_web_socket.dart' show fakes;

pkgs/web_socket_conformance_tests/example/client_test.dart

@@ -1,3 +1,7 @@
+// Copyright (c) 2025, 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.
+
 import 'dart:typed_data';
 
 import 'package:test/test.dart';