Default constructor for dart:io Path now handles native Windows paths. Path() now does the same as…

tests/standalone/io/test_extension_test.dart

Index: tests/standalone/io/test_extension_test.dart
diff --git a/tests/standalone/io/test_extension_test.dart b/tests/standalone/io/test_extension_test.dart
index 619b31d923c8dd07e8567737c0a44c4874cde236..0f5662eafa0132b54d3813f5c6ba7e14fb250967 100644
--- a/tests/standalone/io/test_extension_test.dart
+++ b/tests/standalone/io/test_extension_test.dart
@@ -38,10 +38,10 @@ Path getExtensionPath(Path buildDirectory) {
 void main() {
   Options options = new Options();
 
-  Path scriptDirectory = new Path.fromNative(options.script).directoryPath;
-  Path buildDirectory = new Path.fromNative(options.executable).directoryPath;
+  Path scriptDirectory = new Path(options.script).directoryPath;
+  Path buildDirectory = new Path(options.executable).directoryPath;
   Directory tempDirectory = new Directory('').createTempSync();
-  Path testDirectory = new Path.fromNative(tempDirectory.path);
+  Path testDirectory = new Path(tempDirectory.path);
 
   // Copy test_extension shared library, test_extension.dart and
   // test_extension_tester.dart to the temporary test directory.