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

tests/standalone/io/process_kill_test.dart

Index: tests/standalone/io/process_kill_test.dart
diff --git a/tests/standalone/io/process_kill_test.dart b/tests/standalone/io/process_kill_test.dart
index 400902e85017b13e735907259276eff3ee491488..29e3941d815573138bdb52257decdd59fa21e21b 100644
--- a/tests/standalone/io/process_kill_test.dart
+++ b/tests/standalone/io/process_kill_test.dart
@@ -4,9 +4,9 @@
 //
 // Process test program to test process communication.
 
-#library("ProcessKillTest");
-#import("dart:io");
-#source("process_test_util.dart");
+library ProcessKillTest;
+import "dart:io";
+part "process_test_util.dart";
 
 testKill() {
   // Start a process that will hang waiting for input until killed.