Use 'field' syntax in dart:dom interfaces.

client/dom/generated/src/interface/WebSocket.dart

Index: client/dom/generated/src/interface/WebSocket.dart
diff --git a/client/dom/generated/src/interface/WebSocket.dart b/client/dom/generated/src/interface/WebSocket.dart
index ccd36cab0c883be5adfb062fe8dac5c4b24fe7e6..399d0b732fc428120f0a2d94b9a2b54aabf676d7 100644
--- a/client/dom/generated/src/interface/WebSocket.dart
+++ b/client/dom/generated/src/interface/WebSocket.dart
@@ -16,21 +16,19 @@ interface WebSocket extends EventTarget default _WebSocketFactoryProvider {
 
   static final int OPEN = 1;
 
-  String get URL();
+  final String URL;
 
-  String get binaryType();
+  String binaryType;
 
-  void set binaryType(String value);
+  final int bufferedAmount;
 
-  int get bufferedAmount();
+  final String extensions;
 
-  String get extensions();
+  final String protocol;
 
-  String get protocol();
+  final int readyState;
 
-  int get readyState();
-
-  String get url();
+  final String url;
 
   void addEventListener(String type, EventListener listener, [bool useCapture]);