Make more use of generated code in analysis server.

pkg/analysis_server/lib/src/domain_server.dart

Index: pkg/analysis_server/lib/src/domain_server.dart
diff --git a/pkg/analysis_server/lib/src/domain_server.dart b/pkg/analysis_server/lib/src/domain_server.dart
index 7fc1e2d9bfa68fe094a3171ee6cbe54276f948a3..c2828722c062c019bc36d9778358419a830e2e22 100644
--- a/pkg/analysis_server/lib/src/domain_server.dart
+++ b/pkg/analysis_server/lib/src/domain_server.dart
@@ -28,9 +28,7 @@ class ServerDomainHandler implements RequestHandler {
    * Return the version number of the analysis server.
    */
   Response getVersion(Request request) {
-    Response response = new Response(request.id);
-    response.setResult(VERSION, '0.0.1');
-    return response;
+    return new ServerGetVersionResult('0.0.1').toResponse(request.id);
   }
 
   @override