Add Directory.systemTemp getter to replace createSystemTemp().

runtime/bin/directory.h

 // 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.
 
 #ifndef BIN_DIRECTORY_H_
 #define BIN_DIRECTORY_H_
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
 #include "platform/globals.h"
@@ skipping 239 matching lines @@
     UNKNOWN,
     EXISTS,
     DOES_NOT_EXIST
   };
 
   static void List(DirectoryListing* listing);
   static ExistsResult Exists(const char* path);
   static char* Current();
   static bool SetCurrent(const char* path);
   static bool Create(const char* path);
-  static char* CreateTemp(const char* const_template, bool system);
+  static char* SystemTemp();
+  static char* CreateTemp(const char* path);
   static bool Delete(const char* path, bool recursive);
   static bool Rename(const char* path, const char* new_path);
 
   static CObject* CreateRequest(const CObjectArray& request);
   static CObject* DeleteRequest(const CObjectArray& request);
   static CObject* ExistsRequest(const CObjectArray& request);
   static CObject* CreateTempRequest(const CObjectArray& request);
   static CObject* CreateSystemTempRequest(const CObjectArray& request);
   static CObject* ListStartRequest(const CObjectArray& request);
   static CObject* ListNextRequest(const CObjectArray& request);
   static CObject* ListStopRequest(const CObjectArray& request);
   static CObject* RenameRequest(const CObjectArray& request);
 
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Directory);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_DIRECTORY_H_