Make more use of generated classes in analysis server.

pkg/analysis_server/test/edit/fixes_test.dart

 // Copyright (c) 2014, 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.edit.fixes;
 
 import 'dart:async';
 
-import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/edit/edit_domain.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/protocol2.dart';
 import 'package:analysis_testing/reflective_tests.dart';
 import 'package:unittest/unittest.dart' hide ERROR;
 
 import '../analysis_abstract.dart';
 
 
 main() {
@@ skipping 14 matching lines @@
   Future test_hasFixes() {
     addTestFile('''
 main() {
   print(42)
 }
 ''');
     return waitForTasksFinished().then((_) {
       Request request = new EditGetFixesParams(testFile,
           findOffset('print')).toRequest('0');
       Response response = handleSuccessfulRequest(request);
-      List<Map<String, Object>> errorFixesJsonList = response.getResult(FIXES);
-      expect(errorFixesJsonList, hasLength(1));
+      var result = new EditGetFixesResult.fromResponse(response);
+      List<ErrorFixes> errorFixes = result.fixes;
+      expect(errorFixes, hasLength(1));
       {
-        Map<String, Object> fixes = errorFixesJsonList[0];
-        Map<String, Object> error = fixes[ERROR];
-        expect(error[SEVERITY], 'ERROR');
-        expect(error[TYPE], 'SYNTACTIC_ERROR');
-        expect(fixes[FIXES], hasLength(1));
+        ErrorFixes fixes = errorFixes[0];
+        AnalysisError error = fixes.error;
+        expect(error.severity, ErrorSeverity.ERROR);
+        expect(error.type, ErrorType.SYNTACTIC_ERROR);
+        expect(fixes.fixes, hasLength(1));
       }
     });
   }
 }