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

pkg/analysis_server/test/domain_completion_test.dart

Index: pkg/analysis_server/test/domain_completion_test.dart
diff --git a/pkg/analysis_server/test/domain_completion_test.dart b/pkg/analysis_server/test/domain_completion_test.dart
index 759416c35d3bd9ca7631f4f456237a85d22c67df..9e301335d35e84e95b67c5771f5f9d30907a98a4 100644
--- a/pkg/analysis_server/test/domain_completion_test.dart
+++ b/pkg/analysis_server/test/domain_completion_test.dart
@@ -9,6 +9,8 @@ import 'dart:async';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/domain_completion.dart';
 import 'package:analysis_server/src/protocol.dart';
+import 'package:analysis_server/src/protocol2.dart' show
+    CompletionGetSuggestionsParams;
 import 'package:analysis_server/src/services/completion/completion_suggestion.dart';
 import 'package:analysis_server/src/services/index/index.dart' show Index;
 import 'package:analysis_server/src/services/index/local_memory_index.dart';
@@ -85,9 +87,8 @@ class CompletionTest extends AbstractAnalysisTest {
 
   Future getSuggestions() {
     return waitForTasksFinished().then((_) {
-      Request request = new Request('0', COMPLETION_GET_SUGGESTIONS);
-      request.setParameter(FILE, testFile);
-      request.setParameter(OFFSET, completionOffset);
+      Request request = new CompletionGetSuggestionsParams(testFile,
+          completionOffset).toRequest('0');
       Response response = handleSuccessfulRequest(request);
       completionId = response.getResult(ID);
       assertValidId(completionId);