Make more use of generated code in analysis server.

pkg/analysis_server/test/analysis_notification_overrides_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.domain.analysis.notification.overrides;
 
 import 'dart:async';
 
-import 'package:analysis_server/src/computer/computer_overrides.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol.dart';
-import 'package:analysis_server/src/protocol2.dart' show AnalysisService;
+import 'package:analysis_server/src/protocol2.dart';
 import 'package:analysis_testing/reflective_tests.dart';
 import 'package:unittest/unittest.dart';
 
 import 'analysis_abstract.dart';
 
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(AnalysisNotificationOverridesTest);
 }
@@ skipping 85 matching lines @@
     }
   }
 
   Future prepareOverrides() {
     addAnalysisSubscription(AnalysisService.OVERRIDES, testFile);
     return waitForTasksFinished();
   }
 
   void processNotification(Notification notification) {
     if (notification.event == ANALYSIS_OVERRIDES) {
-      String file = notification.getParameter(FILE);
-      if (file == testFile) {
-        List<Map<String, Object>> jsonList =
-            notification.getParameter(OVERRIDES);
-        overridesList = jsonList.map(Override.fromJson).toList();
+      var params = new AnalysisOverridesParams.fromNotification(notification);
+      if (params.file == testFile) {
+        overridesList = params.overrides;
       }
     }
   }
 
   void setUp() {
     super.setUp();
     createProject();
   }
 
   test_afterAnalysis() {
@@ skipping 208 matching lines @@
   set fff(x) {} // in B
 }
 ''');
     return prepareOverrides().then((_) {
       assertHasOverride('fff(x) {} // in B');
       assertHasSuperElement('fff(x) {} // in A');
       assertNoInterfaceMembers();
     });
   }
 }