Change how File/Directory/Link .delete works.

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 f161b0e12aea5945dce03cb85b4c3bc0e929dace..4e26ec7392689187a9c41b3357b92f7de65bbb01 100644
--- a/tests/standalone/io/windows_file_system_links_test.dart
+++ b/tests/standalone/io/windows_file_system_links_test.dart
@@ -30,13 +30,13 @@ testJunctionTypeDelete() {
 
     // Test Junction pointing to a missing directory.
     new Directory(x).deleteSync();
-    Expect.isTrue(new Directory(y).existsSync());
+    Expect.isTrue(new Link(y).existsSync());
     Expect.isFalse(new Directory(x).existsSync());
     Expect.isTrue(FileSystemEntity.isLinkSync(y));
     Expect.isFalse(FileSystemEntity.isLinkSync(x));
     Expect.isFalse(FileSystemEntity.isDirectorySync(y));
     Expect.isFalse(FileSystemEntity.isDirectorySync(x));
-    Expect.equals(FileSystemEntityType.NOT_FOUND,
+    Expect.equals(FileSystemEntityType.LINK,
                   FileSystemEntity.typeSync(y));
     Expect.equals(FileSystemEntityType.NOT_FOUND,
                   FileSystemEntity.typeSync(x));
@@ -47,7 +47,7 @@ testJunctionTypeDelete() {
     Expect.equals(x, new Link(y).targetSync());
 
     // Delete Junction pointing to a missing directory.
-    new Directory(y).deleteSync();
+    new Link(y).deleteSync();
     Expect.isFalse(FileSystemEntity.isLinkSync(y));
     Expect.equals(FileSystemEntityType.NOT_FOUND,
                   FileSystemEntity.typeSync(y));