Unify the server and plugin versions of the generators

pkg/analysis_server/test/integration/execution/delete_context_test.dart

 // Copyright (c) 2017, 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:analysis_server/plugin/protocol/protocol.dart';
+import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
-import '../integration_tests.dart';
+import '../support/integration_tests.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(DeleteContextTest);
   });
 }
 
 @reflectiveTest
 class DeleteContextTest extends AbstractAnalysisServerIntegrationTest {
   test_delete() async {
@@ skipping 14 matching lines @@
     // After the delete, expect this to fail.
     try {
       result =
           await sendExecutionMapUri(contextId, uri: 'package:foo/main.dart');
       fail('expected exception after context delete');
     } on ServerErrorMessage catch (message) {
       expect(message.error['code'], 'INVALID_PARAMETER');
     }
   }
 }