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

tests/standalone/io/dart_std_io_pipe_test.dart

Index: tests/standalone/io/dart_std_io_pipe_test.dart
diff --git a/tests/standalone/io/dart_std_io_pipe_test.dart b/tests/standalone/io/dart_std_io_pipe_test.dart
index aa9e89d4b63a02bf75149353b6c226684470a732..78a24f5b939ddc0dd433a6ddf8ae98119369d244 100644
--- a/tests/standalone/io/dart_std_io_pipe_test.dart
+++ b/tests/standalone/io/dart_std_io_pipe_test.dart
@@ -10,8 +10,8 @@
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
-#import("dart:io");
-#source("process_test_util.dart");
+import "dart:io";
+part "process_test_util.dart";
 
 void checkFileEmpty(String fileName) {
   RandomAccessFile pipeOut  = new File(fileName).openSync();