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

sdk/lib/io/path_impl.dart

Index: sdk/lib/io/path_impl.dart
diff --git a/sdk/lib/io/path_impl.dart b/sdk/lib/io/path_impl.dart
index d2038381d65d01ca802c4f3331ea2ff46192c307..2b6df862d70442bccd7a405819690f3954b0f3ec 100644
--- a/sdk/lib/io/path_impl.dart
+++ b/sdk/lib/io/path_impl.dart
@@ -8,11 +8,13 @@ class _Path implements Path {
   final String _path;
   final bool isWindowsShare;
 
-  _Path(String source) : _path = source, isWindowsShare = false;
-
-  _Path.fromNative(String source)
+  _Path(String source)
       : _path = _clean(source), isWindowsShare = _isWindowsShare(source);
 
+  _Path.fromNative(String source) : this(source);
+
+  _Path.raw(String source) : _path = source, isWindowsShare = false;
+
   _Path._internal(String this._path, bool this.isWindowsShare);
 
   static String _clean(String source) {