Implement delete on File objects.

runtime/bin/file.dart

 // Copyright (c) 2011, 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.
 
 interface File factory _File {
   /**
    * Create a File object.
    */
   File(String name);
 
@@ skipping 18 matching lines @@
   void create();
 
   /**
    * Synchronously create the file. Existing files are left untouched
    * by create. Calling create on an existing file might fail if there
    * are restrictive permissions on the file.
    */
   void createSync();
 
   /**
+   * Delete the file. The [deleteHandler] is called when the file has
+   * been successfully deleted. The [errorHandler] is called if the
+   * file cannot be deleted.
+   */
+  void delete();
+
+  /**
+   * Synchronously delete the file.
+   */
+  void deleteSync();
+
+  /**
    * Open the file for random access operations. When the file is
    * opened the openHandler is called. Opened files must be closed
    * using the [close] method. By default writable is false.
    */
   void open([bool writable]);
 
   /**
    * Synchronously open the file for random access operations. Opened
    * files must be closed using the [close] method. By default
    * writable is false.
@@ skipping 146 matching lines @@
   FileOutputStream openOutputStream();
 
   /**
    * Get the name of the file.
    */
   String get name();
 
   // Event handlers.
   void set existsHandler(void handler(bool exists));
   void set createHandler(void handler());
+  void set deleteHandler(void handler());
   void set openHandler(void handler());
   void set closeHandler(void handler());
   void set readByteHandler(void handler(int byte));
   void set readListHandler(void handler(int read));
   void set noPendingWriteHandler(void handler());
   void set positionHandler(void handler(int position));
   void set setPositionHandler(void handler());
   void set lengthHandler(void handler(int length));
   void set flushHandler(void handler());
   void set fullPathHandler(void handler(String path));
   void set errorHandler(void handler(String error));
 }
 
 
 interface FileInputStream extends InputStream {
   void close();
 }
 
 
 interface FileOutputStream extends OutputStream {
 }
 
 
 class FileIOException implements Exception {
   const FileIOException([String this.message = ""]);
   String toString() => "FileIOException: $message";
   final String message;
 }