Change integration test send...() methods to use structured objects.

pkg/analysis_server/test/integration/analysis/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.integration.analysis.overrides;
 
-import '../../reflective_tests.dart';
+import 'package:analysis_server/src/protocol.dart';
 import 'package:unittest/unittest.dart';
 
+import '../../reflective_tests.dart';
 import '../integration_tests.dart';
 
 @ReflectiveTestCase()
 class Test extends AbstractAnalysisServerIntegrationTest {
   test_overrides() {
     String pathname = sourcePath('test.dart');
     String text =
         r'''
 abstract class Interface1 {
   method0();
@@ skipping 23 matching lines @@
   method3() {}
   method4() {}
   method5() {}
   method6() {}
   method7() {}
 }
 ''';
     writeFile(pathname, text);
     standardAnalysisSetup();
     sendAnalysisSetSubscriptions({
-      'OVERRIDES': [pathname]
+      AnalysisService.OVERRIDES: [pathname]
     });
     List overrides;
     onAnalysisOverrides.listen((params) {
       expect(params['file'], equals(pathname));
       overrides = params['overrides'];
     });
     return analysisFinished.then((_) {
       int targetOffset = text.indexOf('Target');
       Map findOverride(String methodName) {
         int methodOffset = text.indexOf(methodName, targetOffset);
@@ skipping 47 matching lines @@
       checkOverrides('method5', false, ['Interface2']);
       checkOverrides('method6', true, []);
       checkOverrides('method7', false, []);
     });
   }
 }
 
 main() {
   runReflectiveTests(Test);
 }