Pass AnalysisOptions into SdkCreator, disable changing afterwards.

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 1175320c03e812fd23086e5bb7c45744ca94f0ca..395072a67e4f799a4f9014c5319f77705841a8bd 100644
--- a/pkg/analysis_server/test/socket_server_test.dart
+++ b/pkg/analysis_server/test/socket_server_test.dart
@@ -112,12 +112,12 @@ class SocketServerTest {
     ServerPlugin serverPlugin = new ServerPlugin();
     ExtensionManager manager = new ExtensionManager();
     manager.processPlugins([serverPlugin]);
-    SdkCreator sdkCreator = () =>
+    SdkCreator sdkCreator = (_) =>
         new DirectoryBasedDartSdk(DirectoryBasedDartSdk.defaultSdkDirectory);
     return new SocketServer(
         new AnalysisServerOptions(),
         sdkCreator,
-        sdkCreator(),
+        sdkCreator(null),
         InstrumentationService.NULL_SERVICE,
         serverPlugin,
         null,