Remove old #import, #source, and #library syntax from tests/standalone.

tests/standalone/io/web_socket_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 
-#import("dart:io");
-#import("dart:scalarlist");
+import "dart:io";
+import "dart:scalarlist";
 
 void testRequestResponseClientCloses(
     int totalConnections, int closeStatus, String closeReason) {
   HttpServer server = new HttpServer();
   HttpClient client = new HttpClient();
 
   server.listen("127.0.0.1", 0, backlog: totalConnections);
 
   // Create a web socket handler and set is as the HTTP server default
   // handler.
@@ skipping 314 matching lines @@
   testMessageLength(126);
   testMessageLength(127);
   testMessageLength(65535);
   testMessageLength(65536);
   testNoUpgrade();
   testUsePOST();
   testHashCode(2);
 
   testW3CInterface(2, 3002, "Got tired");
 }