Unify the server and plugin versions of the generators

pkg/analysis_server/test/integration/diagnostic/get_diagnostics_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(GetDiagnosticsTest);
   });
 }
 
 @reflectiveTest
 class GetDiagnosticsTest extends AbstractAnalysisServerIntegrationTest {
   test_getDiagnostics() async {
     standardAnalysisSetup();
 
     DiagnosticGetDiagnosticsResult result =
         await sendDiagnosticGetDiagnostics();
 
     // Do some lightweight validation of the returned data.
     expect(result.contexts, hasLength(1));
     ContextData context = result.contexts.first;
     expect(context.name, isNotEmpty);
   }
 }