dart:io | Make broken links report NOT_FOUND from FileSystemEntity.typeSync on Windows.

tests/standalone/io/windows_file_system_links_test.dart

Index: tests/standalone/io/windows_file_system_links_test.dart
diff --git a/tests/standalone/io/windows_file_system_links_test.dart b/tests/standalone/io/windows_file_system_links_test.dart
index b5a6f09238c6d71566866315e7ca708a8ab1c2fc..a458a5f9e4095ed2823175ec0ce6518855b57b3f 100644
--- a/tests/standalone/io/windows_file_system_links_test.dart
+++ b/tests/standalone/io/windows_file_system_links_test.dart
@@ -32,9 +32,9 @@ testJunctionTypeDelete() {
     Expect.isFalse(new Directory(x).existsSync());
     Expect.isTrue(FileSystemEntity.isLinkSync(y));
     Expect.isFalse(FileSystemEntity.isLinkSync(x));
-    Expect.isTrue(FileSystemEntity.isDirectorySync(y));
+    Expect.isFalse(FileSystemEntity.isDirectorySync(y));
     Expect.isFalse(FileSystemEntity.isDirectorySync(x));
-    Expect.equals(FileSystemEntityType.DIRECTORY,
+    Expect.equals(FileSystemEntityType.NOT_FOUND,
                   FileSystemEntity.typeSync(y));
     Expect.equals(FileSystemEntityType.NOT_FOUND,
                   FileSystemEntity.typeSync(x));