Get rid of 'close' on process. It is very easy to use incorrectly and cut off data from your stream…

tests/standalone/io/process_working_directory_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.
 //
 // Process working directory test.
 
 #library("ProcessWorkingDirectoryTest");
 #import("dart:io");
 #source("process_test_util.dart");
 
 class ProcessWorkingDirectoryTest {
   static String get fullTestFilePath {
     // Extract full path, since we run processes from another directory.
     File path = new File(getProcessTestFileName());
     Expect.isTrue(path.existsSync());
     return path.fullPathSync();
   }
 
   static void testValidDirectory() {
     Directory directory = new Directory("").createTempSync();
     Expect.isTrue(directory.existsSync());
 
     var options = new ProcessOptions();
     options.workingDirectory = directory.path;
     var processFuture =
         Process.start(fullTestFilePath, const ["0", "0", "99", "0"], options);
     processFuture.then((process) {
       process.onExit = (int exitCode) {
         Expect.equals(exitCode, 99);
-        process.close();
         directory.deleteSync();
       };
+      process.stdout.onData = process.stdout.read;
+      process.stderr.onData = process.stderr.read;
     });
     processFuture.handleException((error) {
       directory.deleteSync();
       Expect.fails("Couldn't start process");
     });
   }
 
   static void testInvalidDirectory() {
     Directory directory = new Directory("").createTempSync();
     Expect.isTrue(directory.existsSync());
 
     var options = new ProcessOptions();
     options.workingDirectory = directory.path.concat("/subPath");
     var future = Process.start(fullTestFilePath,
                                const ["0", "0", "99", "0"],
                                options);
     future.then((process) {
       Expect.fail("bad process completed");
-      process.close();
       directory.deleteSync();
     });
 
     future.handleException((e) {
       Expect.isNotNull(e);
       directory.deleteSync();
       return true;
     });
   }
 }
 
 
 
 main() {
   ProcessWorkingDirectoryTest.testValidDirectory();
   ProcessWorkingDirectoryTest.testInvalidDirectory();
 }