Implement delete methods for the various CannedBrowsingDataHelpers.

chrome/browser/browsing_data/browsing_data_file_system_helper.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/browsing_data/browsing_data_file_system_helper.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/message_loop/message_loop.h"
 #include "base/sequenced_task_runner.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browsing_data/browsing_data_helper.h"
 #include "content/public/browser/browser_thread.h"
 #include "webkit/browser/fileapi/file_system_context.h"
 #include "webkit/browser/fileapi/file_system_quota_util.h"
 #include "webkit/common/fileapi/file_system_types.h"
 
 using content::BrowserThread;
@@ skipping 227 matching lines @@
 }
 
 size_t CannedBrowsingDataFileSystemHelper::GetFileSystemCount() const {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   return file_system_info_.size();
 }
 
 void CannedBrowsingDataFileSystemHelper::StartFetching(
     const base::Callback<void(const std::list<FileSystemInfo>&)>& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  DCHECK(!is_fetching_);
-  DCHECK_EQ(false, callback.is_null());
-  is_fetching_ = true;
-  completion_callback_ = callback;
+  DCHECK(!callback.is_null());
 
   BrowserThread::PostTask(
-      BrowserThread::UI, FROM_HERE,
-      base::Bind(&CannedBrowsingDataFileSystemHelper::NotifyOnUIThread, this));
+      BrowserThread::UI, FROM_HERE, base::Bind(callback, file_system_info_));
 }
-
-void CannedBrowsingDataFileSystemHelper::NotifyOnUIThread() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  DCHECK(is_fetching_);
-  completion_callback_.Run(file_system_info_);
-  completion_callback_.Reset();
-  is_fetching_ = false;
-}