Fix test on Windows

tests/standalone/io/platform_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:async";
 import "dart:io";
 import "dart:isolate";
 
 import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
@@ skipping 20 matching lines @@
     Expect.isTrue(Platform.executable.endsWith('dart.exe'));
     Expect.isTrue(Platform.resolvedExecutable.endsWith('dart.exe'));
   }
   if (!Platform.isWindows) {
     Expect.isTrue(Platform.resolvedExecutable.startsWith('/'));
   } else {
     // This assumes that tests (both locally and on the bots) are
     // running off a location referred to by a drive letter. If a UNC
     // location is used or long names ("\\?\" prefix) is used this
     // needs to be fixed.
-    Expect.equals(Platform.executable.substring(1, 3), ':\\');
+    Expect.equals(Platform.resolvedExecutable.substring(1, 3), ':\\');
   }
   // Move directory to be sure script is correct.
   var oldDir = Directory.current;
   Directory.current = Directory.current.parent;
   Expect.isTrue(Platform.script.path.
                 endsWith('tests/standalone/io/platform_test.dart'));
   Expect.isTrue(Platform.script.toFilePath().startsWith(oldDir.path));
   // Restore dir.
   Directory.current = oldDir;
   Directory packageRoot = new Directory(Platform.packageRoot);
@@ skipping 80 matching lines @@
   Expect.throws(() => checkValidVersion('x.y.z'));
 }
 
 main() {
   // This tests assumes paths relative to dart main directory
   Directory.current = Platform.script.resolve('../../..').toFilePath();
   test();
   testIsolate();
   testVersion();
 }