Modify tests to use Directory.systemTemp

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 cc37115afaf4e1ebce546adce5def41a8d836b64..9e89392f4a1fe3a8496c91458bcdfda063cd6d46 100644
--- a/tests/standalone/io/dart_std_io_pipe_test.dart
+++ b/tests/standalone/io/dart_std_io_pipe_test.dart
@@ -32,7 +32,7 @@ void checkFileContent(String fileName, String content) {
 
 
 void test(String shellScript, String dartScript, String type, bool devNull) {
-  Directory dir = new Directory("").createTempSync();
+  Directory dir = Directory.createSystemTempSync('dart_dart_std_io_pipe');

[Søren Gjesse, 2013/10/01 14:38:41]

Great to have the name of the test in the temp directory name! Should we maybe
use a function that generates this from Platform.script?

 
   // The shell script will run the dart executable passed with a
   // number of different redirections of stdio.