Use generated classes to create requests in analysis server unit tests.

pkg/analysis_server/test/search/element_references_test.dart

Index: pkg/analysis_server/test/search/element_references_test.dart
diff --git a/pkg/analysis_server/test/search/element_references_test.dart b/pkg/analysis_server/test/search/element_references_test.dart
index 05d4981af1e9370347fb28bedfa0b99e367bfddc..1139d1029ea5231c7d81478b096a7a4a32d53625 100644
--- a/pkg/analysis_server/test/search/element_references_test.dart
+++ b/pkg/analysis_server/test/search/element_references_test.dart
@@ -9,6 +9,8 @@ import 'dart:async';
 import 'package:analysis_server/src/computer/element.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol.dart';
+import 'package:analysis_server/src/protocol2.dart' show
+    SearchFindElementReferencesParams;
 import 'package:analysis_server/src/search/search_result.dart';
 import 'package:analysis_testing/reflective_tests.dart';
 import 'package:unittest/unittest.dart';
@@ -29,10 +31,8 @@ class ElementReferencesTest extends AbstractSearchDomainTest {
   Future findElementReferences(String search, bool includePotential) {
     int offset = findOffset(search);
     return waitForTasksFinished().then((_) {
-      Request request = new Request('0', SEARCH_FIND_ELEMENT_REFERENCES);
-      request.setParameter(FILE, testFile);
-      request.setParameter(OFFSET, offset);
-      request.setParameter(INCLUDE_POTENTIAL, includePotential);
+      Request request = new SearchFindElementReferencesParams(testFile, offset,
+          includePotential).toRequest('0');
       Response response = handleSuccessfulRequest(request);
       searchId = response.getResult(ID);
       searchElement = response.getResult(ELEMENT);