Generate constants in server as we do in plugin

pkg/analysis_server/test/socket_server_test.dart

Index: pkg/analysis_server/test/socket_server_test.dart
diff --git a/pkg/analysis_server/test/socket_server_test.dart b/pkg/analysis_server/test/socket_server_test.dart
index 461620548c324ef08e773d9b3e37007b5dbb3f33..f25ef4499594d24e248c46f4c0c6af391d0fee5b 100644
--- a/pkg/analysis_server/test/socket_server_test.dart
+++ b/pkg/analysis_server/test/socket_server_test.dart
@@ -5,9 +5,9 @@
 import 'dart:async';
 
 import 'package:analysis_server/protocol/protocol.dart';
+import 'package:analysis_server/protocol/protocol_constants.dart';
 import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/analysis_server.dart';
-import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/plugin/server_plugin.dart';
 import 'package:analysis_server/src/socket_server.dart';
 import 'package:analyzer/file_system/physical_file_system.dart';
@@ -37,7 +37,8 @@ class SocketServerTest {
     MockServerChannel channel1 = new MockServerChannel();
     MockServerChannel channel2 = new MockServerChannel();
     server.createAnalysisServer(channel1);
-    expect(channel1.notificationsReceived[0].event, SERVER_CONNECTED);
+    expect(
+        channel1.notificationsReceived[0].event, SERVER_NOTIFICATION_CONNECTED);
     server.createAnalysisServer(channel2);
     channel1.expectMsgCount(notificationCount: 1);
     channel2.expectMsgCount(responseCount: 1);
@@ -61,7 +62,8 @@ class SocketServerTest {
     MockServerChannel channel = new MockServerChannel();
     server.createAnalysisServer(channel);
     channel.expectMsgCount(notificationCount: 1);
-    expect(channel.notificationsReceived[0].event, SERVER_CONNECTED);
+    expect(
+        channel.notificationsReceived[0].event, SERVER_NOTIFICATION_CONNECTED);
     return channel
         .sendRequest(new ServerShutdownParams().toRequest('0'))
         .then((Response response) {
@@ -76,7 +78,8 @@ class SocketServerTest {
     MockServerChannel channel = new MockServerChannel();
     server.createAnalysisServer(channel);
     channel.expectMsgCount(notificationCount: 1);
-    expect(channel.notificationsReceived[0].event, SERVER_CONNECTED);
+    expect(
+        channel.notificationsReceived[0].event, SERVER_NOTIFICATION_CONNECTED);
     _MockRequestHandler handler = new _MockRequestHandler(false);
     server.analysisServer.handlers = [handler];
     var request = new ServerGetVersionParams().toRequest('0');
@@ -102,7 +105,7 @@ class SocketServerTest {
       expect(response.id, equals('0'));
       expect(response.error, isNull);
       channel.expectMsgCount(responseCount: 1, notificationCount: 2);
-      expect(channel.notificationsReceived[1].event, SERVER_ERROR);
+      expect(channel.notificationsReceived[1].event, SERVER_NOTIFICATION_ERROR);
     });
   }