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

tests/standalone/io/http_connection_close_test.dart

Index: tests/standalone/io/http_connection_close_test.dart
diff --git a/tests/standalone/io/http_connection_close_test.dart b/tests/standalone/io/http_connection_close_test.dart
index c46dd417a4fb0f25be4f95aafee45e9b690f516f..1e1022323f8243dd5bc71e92901886f2f25c0a44 100644
--- a/tests/standalone/io/http_connection_close_test.dart
+++ b/tests/standalone/io/http_connection_close_test.dart
@@ -3,9 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 //
 
-#import("dart:isolate");
-#import("dart:io");
-#import("dart:uri");
+import "dart:isolate";
+import "dart:io";
+import "dart:uri";
 
 void testHttp10Close(bool closeRequest) {
   HttpServer server = new HttpServer();