More strong mode changes to analysis_server

pkg/analysis_server/test/services/linter/linter_test.dart

 // Copyright (c) 2015, 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.
 
 library test.services.linter;
 
 import 'package:analysis_server/src/services/linter/linter.dart';
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/source/analysis_options_provider.dart';
 import 'package:analyzer/src/generated/engine.dart';
@@ skipping 56 matching lines @@
   test_linter_undefined_rule() {
     validate(
         '''
 linter:
   rules:
     - undefined
     ''',
         [UNDEFINED_LINT_WARNING]);
   }
 
-  validate(String source, List<AnalysisOptionsErrorCode> expected) {
+  validate(String source, List<ErrorCode> expected) {
     var options = optionsProvider.getOptionsFromString(source);
     validator.validate(reporter, options);
     expect(errors.map((AnalysisError e) => e.errorCode),
         unorderedEquals(expected));
   }
 }
 
 class _TestSource implements Source {
   @override
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }