dart:io | Revert addition of Link class, because it conflicts with a Link class in dart2js.

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 136 matching lines @@
   const wchar_t* system_name = StringUtils::Utf8ToWide(name);
   int fd = _wopen(system_name, O_RDONLY | O_CREAT, 0666);
   free(const_cast<wchar_t*>(system_name));
   if (fd < 0) {
     return false;
   }
   return (close(fd) == 0);
 }
 
 
-bool File::CreateLink(const char* name, const char* target) {
-  // TODO(whesse): Implement Junction creation.
-  return false;
-}
-
-
 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;
   }
   return true;
 }
 
@@ skipping 122 matching lines @@
       return File::kDoesNotExist;
     }
   } else if ((attributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
     return File::kIsDirectory;
   } else {
     return File::kIsFile;
   }
 }
 
 #endif  // defined(TARGET_OS_WINDOWS)