Async is no longer optional

pkg/analysis_server/lib/src/status/get_handler.dart

Index: pkg/analysis_server/lib/src/status/get_handler.dart
diff --git a/pkg/analysis_server/lib/src/status/get_handler.dart b/pkg/analysis_server/lib/src/status/get_handler.dart
index 99f88b3d5d556e7afde5b1540fbb6cd1d2c2ed4e..bf0ef2cca18bb1544d41ea57900707b3ba4ee234 100644
--- a/pkg/analysis_server/lib/src/status/get_handler.dart
+++ b/pkg/analysis_server/lib/src/status/get_handler.dart
@@ -46,7 +46,8 @@ import 'package:analyzer/src/task/dart.dart';
 import 'package:analyzer/src/task/driver.dart';
 import 'package:analyzer/src/task/html.dart';
 import 'package:analyzer/src/task/options.dart';
-import 'package:analyzer/src/task/options.dart' show CONFIGURED_ERROR_PROCESSORS;
+import 'package:analyzer/src/task/options.dart'
+    show CONFIGURED_ERROR_PROCESSORS;
 import 'package:analyzer/task/dart.dart';
 import 'package:analyzer/task/general.dart';
 import 'package:analyzer/task/html.dart';
@@ -1407,7 +1408,6 @@ class GetHandler {
       _writeOption(
           buffer, 'Analyze functon bodies', options.analyzeFunctionBodies);
       _writeOption(buffer, 'Cache size', options.cacheSize);
-      _writeOption(buffer, 'Enable async support', options.enableAsync);
       _writeOption(
           buffer, 'Enable generic methods', options.enableGenericMethods);
       _writeOption(