Remove DeleteTask and convert remaining users.

chrome/browser/spellchecker/spellcheck_host_impl.h

 // Copyright (c) 2011 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 CHROME_BROWSER_SPELLCHECKER_SPELLCHECK_HOST_IMPL_H_
 #define CHROME_BROWSER_SPELLCHECKER_SPELLCHECK_HOST_IMPL_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
+#include "base/message_loop_helpers.h"
 #include "chrome/browser/spellchecker/spellcheck_host.h"
 #include "chrome/browser/spellchecker/spellcheck_profile_provider.h"
 #include "content/public/common/url_fetcher_delegate.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 // This class implements the SpellCheckHost interface to provide the
 // functionalities listed below:
 // * Adding a word to the custom dictionary;
 // * Storing the custom dictionary to the file, and read it back
@@ skipping 32 matching lines @@
   virtual void AddWord(const std::string& word) OVERRIDE;
   virtual const base::PlatformFile& GetDictionaryFile() const OVERRIDE;
   virtual const std::string& GetLanguage() const OVERRIDE;
   virtual bool IsUsingPlatformChecker() const OVERRIDE;
 
  private:
   typedef SpellCheckProfileProvider::CustomWordList CustomWordList;
 
   // These two classes can destruct us.
   friend class content::BrowserThread;
-  friend class DeleteTask<SpellCheckHostImpl>;
+  friend class base::DeleteHelper<SpellCheckHostImpl>;
 
   // Figure out the location for the dictionary. This is only non-trivial for
   // Windows:
   // The default place whether the spellcheck dictionary can reside is
   // chrome::DIR_APP_DICTIONARIES. However, for systemwide installations,
   // this directory may not have permissions for download. In that case, the
   // alternate directory for download is chrome::DIR_USER_DATA.
   void InitializeDictionaryLocation();
   void InitializeDictionaryLocationComplete();
 
@@ skipping 87 matching lines @@
   SpellCheckHostMetrics* metrics_;
 
   base::WeakPtrFactory<SpellCheckHostImpl> weak_ptr_factory_;
 
   scoped_ptr<CustomWordList> custom_words_;
 
   DISALLOW_COPY_AND_ASSIGN(SpellCheckHostImpl);
 };
 
 #endif  // CHROME_BROWSER_SPELLCHECKER_SPELLCHECK_HOST_IMPL_H_