dart:io | Remove deprecated behavior of Directory('').createTemp, replaced by Directory.systemTemp.

sdk/lib/io/directory_impl.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.
 
 part of dart.io;
 
 class _Directory extends FileSystemEntity implements Directory {
   final String path;
 
   _Directory(String this.path) {
@@ skipping 137 matching lines @@
     if (result is OSError) {
       throw new DirectoryException("Creation failed", path, result);
     }
   }
 
   static Directory get systemTemp => new Directory(_systemTemp());
 
   Future<Directory> createTemp([String prefix]) {
     if (prefix == null) prefix = '';
     if (path == '') {
-      return systemTemp.createTemp(prefix);
-      // TODO(13720): On Oct 18, 2013, replace this with
-      // an error.  createTemp cannot be called on a Directory with empty path.
+      throw new ArgumentError(
+          "Directory.createTemp called with an empty path. "
+          "To use the system temp directory, use Directory.systemTemp");
     }
     String fullPrefix;
     if (path.endsWith('/') || (Platform.isWindows && path.endsWith('\\'))) {
       fullPrefix = "$path$prefix";
     } else {
       fullPrefix = "$path${Platform.pathSeparator}$prefix";
     }
     return _IOService.dispatch(_DIRECTORY_CREATE_TEMP, [fullPrefix])
         .then((response) {
       if (_isErrorResponse(response)) {
         throw _exceptionOrErrorFromResponse(
             response, "Creation of temporary directory failed");
       }
       return new Directory(response);
     });
   }
 
   Directory createTempSync([String prefix]) {
     if (prefix == null) prefix = '';
     if (path == '') {
-      return systemTemp.createTempSync(prefix);
-      // TODO(13720): On Oct 18, 2013, replace this with
-      // an error.  createTemp cannot be called on a Directory with empty path.
+      throw new ArgumentError(
+          "Directory.createTemp called with an empty path. "
+          "To use the system temp directory, use Directory.systemTemp");
     }
     String fullPrefix;
     if (path.endsWith('/') || (Platform.isWindows && path.endsWith('\\'))) {
       fullPrefix = "$path$prefix";
     } else {
       fullPrefix = "$path${Platform.pathSeparator}$prefix";
     }
     var result = _createTemp(fullPrefix);
     if (result is OSError) {
       throw new DirectoryException("Creation of temporary directory failed",
@@ skipping 202 matching lines @@
       controller.addError(
           new DirectoryException("Directory listing failed",
                                  errorPath,
                                  err));
     } else {
       controller.addError(
           new DirectoryException("Internal error"));
     }
   }
 }