Remove another case of _sanitizeWindowsPath before Uri.file

runtime/bin/builtin.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.
 
 library builtin;
 import 'dart:io';
 import 'dart:async';
 import 'dart:convert';
 // import 'root_library'; happens here from C Code
 
@@ skipping 148 matching lines @@
 var _entryPointScript;
 // The directory to look in to resolve "package:" scheme URIs.
 var _packageRoot;
 
 
 void _setWindows() {
   _isWindows = true;
 }
 
 
-_sanitizeWindowsPath(path) {
-  // For Windows we need to massage the paths a bit according to
-  // http://blogs.msdn.com/b/ie/archive/2006/12/06/file-uris-in-windows.aspx
-  //
-  // Convert
-  // C:\one\two\three
-  // to
-  // /C:/one/two/three
-
-  if (_isWindows == false) {
-    // Do nothing when not running Windows.
-    return path;
-  }
-
-  var fixedPath = "${path.replaceAll('\\', '/')}";
-
-  if ((path.length > 2) && (path[1] == ':')) {
-    // Path begins with a drive letter.
-    return '/$fixedPath';
-  }
-
-  return fixedPath;
-}
-
-
 _enforceTrailingSlash(uri) {
   // Ensure we have a trailing slash character.
   if (!uri.endsWith('/')) {
     return '$uri/';
   }
   return uri;
 }
 
 
 _extractDriveLetterPrefix(cwd) {
@@ skipping 29 matching lines @@
     _packageRoot = _workingDirectoryUri.resolveUri(new Uri.file(packageRoot));
   }
   _logResolution('# Package root: $packageRoot -> $_packageRoot');
 }
 
 
 String _resolveScriptUri(String scriptName) {
   if (_workingDirectoryUri == null) {
     throw 'No current working directory set.';
   }
-  scriptName = _sanitizeWindowsPath(scriptName);
   var scriptUri;
   if (scriptName.startsWith("file:") ||
       scriptName.startsWith("http:") ||
       scriptName.startsWith("https:")) {
     scriptUri = Uri.parse(scriptName);
   } else {
     // Assume it's a file name.
     scriptUri = new Uri.file(scriptName);
   }
   if (scriptUri.scheme != '') {
@@ skipping 198 matching lines @@
   } else if (Platform.isWindows) {
     filename = '$name.dll';
   } else {
     _logResolution(
         'Native extensions not supported on ${Platform.operatingSystem}');
     throw 'Native extensions not supported on ${Platform.operatingSystem}';
   }
 
   return [path, filename, name];
 }