Remove task.h and finish base::Bind() migration.

chrome/browser/extensions/settings/settings_backend.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_EXTENSIONS_SETTINGS_SETTINGS_BACKEND_H_
 #define CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_BACKEND_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list_threadsafe.h"
-#include "base/task.h"
 #include "chrome/browser/extensions/settings/settings_leveldb_storage.h"
 #include "chrome/browser/extensions/settings/settings_observer.h"
 #include "chrome/browser/extensions/settings/syncable_settings_storage.h"
 #include "chrome/browser/sync/api/syncable_service.h"
 
 namespace extensions {
 
 // Manages SettingsStorage objects for extensions, including routing
 // changes from sync to them.
 // Lives entirely on the FILE thread.
@@ skipping 65 matching lines @@
 
   // Current sync processor, if any.
   SyncChangeProcessor* sync_processor_;
 
   DISALLOW_COPY_AND_ASSIGN(SettingsBackend);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_BACKEND_H_