Remove "unnecessary" imports. (#78666)

packages/flutter_goldens/test/flutter_goldens_test.dart

@@ -5,7 +5,7 @@
 import 'dart:async';
 import 'dart:convert';
 import 'dart:core';
-import 'dart:io';
+import 'dart:io' hide Directory;
 import 'dart:typed_data';
 import 'dart:ui' show hashValues, hashList;
 

packages/flutter_tools/lib/src/commands/build_ios_framework.dart

@@ -4,7 +4,6 @@
 
 // @dart = 2.8
 
-import 'package:file/file.dart';
 import 'package:meta/meta.dart';
 
 import '../artifacts.dart';

packages/flutter_tools/lib/src/commands/logs.dart

@@ -8,7 +8,6 @@ import 'dart:async';
 
 import '../base/common.dart';
 import '../base/io.dart';
-import '../cache.dart';
 import '../device.dart';
 import '../globals_null_migrated.dart' as globals;
 import '../runner/flutter_command.dart';

packages/flutter_tools/lib/src/commands/test.dart

@@ -13,7 +13,6 @@ import '../base/common.dart';
 import '../base/file_system.dart';
 import '../build_info.dart';
 import '../bundle.dart';
-import '../cache.dart';
 import '../devfs.dart';
 import '../device.dart';
 import '../globals_null_migrated.dart' as globals;

packages/flutter_tools/test/integration.shard/daemon_mode_test.dart

@@ -6,13 +6,11 @@
 
 import 'dart:async';
 import 'dart:convert';
-import 'dart:io';
+import 'dart:io' hide Directory;
 
-import 'package:file/file.dart';
-import 'package:flutter_tools/src/base/file_system.dart';
-import 'package:flutter_tools/src/base/io.dart';
 import 'package:process/process.dart';
 
+import 'package:file/file.dart';
 import '../src/common.dart';
 import 'test_data/basic_project.dart';
 import 'test_driver.dart';

packages/flutter_tools/test/integration.shard/expression_evaluation_test.dart

@@ -5,7 +5,6 @@
 // @dart = 2.8
 
 import 'package:file/file.dart';
-import 'package:matcher/matcher.dart';
 
 import 'package:vm_service/vm_service.dart';
 

packages/flutter_tools/test/integration.shard/flutter_run_test.dart

@@ -9,7 +9,6 @@ import 'package:flutter_tools/src/base/io.dart';
 import 'package:process/process.dart';
 
 import '../src/common.dart';
-import '../src/context.dart';
 import 'test_data/basic_project.dart';
 import 'test_driver.dart';
 import 'test_utils.dart';

packages/flutter_tools/test/integration.shard/vmservice_integration_test.dart

@@ -6,7 +6,6 @@
 
 import 'package:file/file.dart';
 import 'package:flutter_tools/src/base/file_system.dart';
-import 'package:matcher/matcher.dart';
 import 'package:vm_service/vm_service.dart';
 import 'package:vm_service/vm_service_io.dart';
 

packages/flutter_tools/test/src/fake_http_client.dart

@@ -9,8 +9,6 @@ import 'dart:convert';
 
 import 'dart:io';
 
-import 'package:flutter_tools/src/base/io.dart';
-
 /// The HTTP verb for a [FakeRequest].
 enum HttpMethod {
   get,

packages/flutter_tools/test/web.shard/expression_evaluation_web_test.dart

@@ -5,7 +5,6 @@
 // @dart = 2.8
 
 import 'package:file/file.dart';
-import 'package:matcher/matcher.dart';
 import 'package:vm_service/vm_service.dart';
 
 import '../integration.shard/test_data/basic_project.dart';