test rename overhaul: step 12 - standalone

tests/standalone/io/process_environment_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.
 
 #import('dart:io');
 #import('dart:isolate');
-#source('ProcessTestUtil.dart');
+#source('process_test_util.dart');
 
 runEnvironmentProcess(Map environment, name, callback) {
   var dartExecutable = getDartFileName();
   var options = new ProcessOptions();
   options.environment = environment;
-  var printEnv = 'tests/standalone/src/io/PrintEnv.dart';
+  var printEnv = 'tests/standalone/io/print_env.dart';
   if (!new File(printEnv).existsSync()) {
     printEnv = '../$printEnv';
   }
   var process = new Process.run(dartExecutable,
                                 [printEnv, name],
                                 options,
                                 (exit, out, err) {
     Expect.equals(0, exit);
     callback(out);
   });
@@ skipping 24 matching lines @@
     });
     // Only check one value to not spin up too many processes testing the
     // same things.
     break;
   }
 }
 
 main() {
   testEnvironment();
 }