[Blink-FileAPI] Add the notification of update observer.

storage/browser/fileapi/remove_operation_delegate.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef STORAGE_BROWSER_FILEAPI_REMOVE_OPERATION_DELEGATE_H_
 #define STORAGE_BROWSER_FILEAPI_REMOVE_OPERATION_DELEGATE_H_
 
 #include <stack>
 
 #include "storage/browser/fileapi/recursive_operation_delegate.h"
@@ skipping 14 matching lines @@
                            const StatusCallback& callback) OVERRIDE;
   virtual void ProcessDirectory(const FileSystemURL& url,
                                 const StatusCallback& callback) OVERRIDE;
   virtual void PostProcessDirectory(const FileSystemURL& url,
                                     const StatusCallback& callback) OVERRIDE;
 
  private:
   void DidTryRemoveFile(base::File::Error error);
   void DidTryRemoveDirectory(base::File::Error remove_file_error,
                              base::File::Error remove_directory_error);
-  void DidRemoveFile(const StatusCallback& callback,
+  void DidRemoveFile(const FileSystemURL& url,
+                     const StatusCallback& callback,
                      base::File::Error error);
+  void NotifyOnStartUpdate(const FileSystemURL& url);
+  void NotifyOnEndUpdate(const FileSystemURL& url);
 
   FileSystemURL url_;
   StatusCallback callback_;
   base::WeakPtrFactory<RemoveOperationDelegate> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(RemoveOperationDelegate);
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_FILEAPI_REMOVE_OPERATION_DELEGATE_H_