Change foundation references in foundation to meta (#9107)

* Change foundation references to meta

* Remove specified shows

packages/flutter/lib/src/foundation/binding.dart

@@ -7,7 +7,7 @@ import 'dart:convert' show JSON;
 import 'dart:developer' as developer;
 import 'dart:io' show exit;
 
-import 'package:flutter/foundation.dart';
+import 'package:meta/meta.dart';
 
 import 'assertions.dart';
 import 'basic_types.dart';

packages/flutter/lib/src/foundation/change_notifier.dart

@@ -2,7 +2,7 @@
 // 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:meta/meta.dart';
 
 import 'assertions.dart';
 import 'basic_types.dart';