Remove "unnecessary" imports. (#76159)

packages/flutter_goldens/lib/flutter_goldens.dart

@@ -11,7 +11,6 @@ import 'package:file/file.dart';
 import 'package:file/local.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:meta/meta.dart';
 import 'package:platform/platform.dart';
 
 import 'package:flutter_goldens_client/skia_client.dart';

packages/flutter_localizations/test/material/time_picker_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:flutter_test/flutter_test.dart';

packages/flutter_localizations/test/text_test.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:flutter_test/flutter_test.dart';