Fix directory-listing, directory-deletion and file deletion, when links are involved.

runtime/bin/file_win.cc

 // 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.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "bin/file.h"
 
 #include <fcntl.h>  // NOLINT
@@ skipping 241 matching lines @@
       NULL);
   if (CloseHandle(dir_handle) == 0) return false;
   free(const_cast<wchar_t*>(target));
   free(reparse_data_buffer);
   return (result != 0);
 }
 
 
 bool File::Delete(const char* name) {
   const wchar_t* system_name = StringUtils::Utf8ToWide(name);
-  int status = _wremove(system_name);
-  free(const_cast<wchar_t*>(system_name));
-  if (status == -1) {
-    return false;
+  DWORD attributes = GetFileAttributesW(system_name);
+  if ((attributes != INVALID_FILE_ATTRIBUTES) &&
+      (attributes & FILE_ATTRIBUTE_REPARSE_POINT) != 0) {
+    // It's a junction(link), delete it.
+    return RemoveDirectoryW(system_name) != 0;
+  } else {
+    int status = _wremove(system_name);
+    free(const_cast<wchar_t*>(system_name));
+    if (status == -1) {
+      return false;
+    }
+    return true;
   }
-  return true;
 }
 
 
 off_t File::LengthFromPath(const char* name) {
   struct _stat st;
   const wchar_t* system_name = StringUtils::Utf8ToWide(name);
   int stat_status = _wstat(system_name, &st);
   free(const_cast<wchar_t*>(system_name));
   if (stat_status == 0) {
     return st.st_size;
@@ skipping 271 matching lines @@
   if (file_info[0].dwVolumeSerialNumber == file_info[1].dwVolumeSerialNumber &&
       file_info[0].nFileIndexHigh == file_info[1].nFileIndexHigh &&
       file_info[0].nFileIndexLow == file_info[1].nFileIndexLow) {
     return kIdentical;
   } else {
     return kDifferent;
   }
 }
 
 #endif  // defined(TARGET_OS_WINDOWS)