Refactor Future constructors.

runtime/bin/socket_patch.dart

Index: runtime/bin/socket_patch.dart
diff --git a/runtime/bin/socket_patch.dart b/runtime/bin/socket_patch.dart
index 81e8ab379728d001376dd6c6a8b4179a6f799f6d..96d7bcf2e6f9ba8d1a224f8bd5902f1171fb8341 100644
--- a/runtime/bin/socket_patch.dart
+++ b/runtime/bin/socket_patch.dart
@@ -115,11 +115,11 @@ class _NativeSocket extends NativeFieldWrapperClass1 {
     var socket = new _NativeSocket.listen();
     var result = socket.nativeCreateBindListen(address, port, backlog);
     if (result is OSError) {
-      return new Future.immediateError(
+      return new Future.error(
           new SocketIOException("Failed to create server socket", result));
     }
     if (port != 0) socket.localPort = port;
-    return new Future.immediate(socket);
+    return new Future.value(socket);
   }
 
   _NativeSocket.normal() : typeFlags = TYPE_NORMAL_SOCKET {