Remove "unnecessary" imports in test/services (#75707)

packages/flutter/test/services/binding_test.dart

@@ -2,12 +2,9 @@
 // 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:flutter/foundation.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:flutter/services.dart';
-import 'package:flutter/src/services/binding.dart';
 
 import 'package:flutter_test/flutter_test.dart';
 

packages/flutter/test/services/fake_platform_views.dart

@@ -6,7 +6,6 @@ import 'dart:async';
 import 'dart:typed_data';
 
 import 'package:flutter/foundation.dart';
-import 'package:flutter/painting.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 

packages/flutter/test/services/message_codecs_test.dart

@@ -10,7 +10,6 @@ import 'dart:typed_data';
 
 import 'package:flutter/foundation.dart' show WriteBuffer;
 import 'package:flutter/services.dart';
-import 'package:matcher/matcher.dart';
 import '../flutter_test_alternative.dart';
 import 'message_codecs_testing.dart';
 

packages/flutter/test/services/platform_channel_test.dart

@@ -2,8 +2,6 @@
 // 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:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart' show TestWidgetsFlutterBinding;
 

packages/flutter/test/services/platform_messages_test.dart

@@ -3,8 +3,6 @@
 // found in the LICENSE file.
 
 @TestOn('!chrome')
-import 'dart:typed_data';
-
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 

packages/flutter/test/services/system_chrome_test.dart

@@ -3,8 +3,6 @@
 // found in the LICENSE file.
 
 
-import 'dart:typed_data';
-
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';