Remove PrefObserver usages, batch 13.

chrome/browser/notifications/notification_ui_manager_impl.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/notifications/notification_ui_manager_impl.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 33 matching lines @@
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(QueuedNotification);
 };
 
 NotificationUIManagerImpl::NotificationUIManagerImpl(PrefService* local_state)
     : balloon_collection_(NULL),
       is_user_active_(true) {
   registrar_.Add(this, chrome::NOTIFICATION_APP_TERMINATING,
                  content::NotificationService::AllSources());
-  position_pref_.Init(prefs::kDesktopNotificationPosition, local_state, this);
+  position_pref_.Init(
+      prefs::kDesktopNotificationPosition,
+      local_state,
+      base::Bind(
+          &NotificationUIManagerImpl::OnDesktopNotificationPositionChanged,
+          base::Unretained(this)));
 #if defined(OS_MACOSX)
   InitFullScreenMonitor();
   InitIdleMonitor();
 #endif
 }
 
 NotificationUIManagerImpl::~NotificationUIManagerImpl() {
   STLDeleteElements(&show_queue_);
 #if defined(OS_MACOSX)
   StopIdleMonitor();
@@ skipping 168 matching lines @@
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   if (type == chrome::NOTIFICATION_APP_TERMINATING) {
     CancelAll();
   } else {
     NOTREACHED();
   }
 }
 
-void NotificationUIManagerImpl::OnPreferenceChanged(
-    PrefServiceBase* service,
-    const std::string& pref_name) {
-  if (pref_name == prefs::kDesktopNotificationPosition) {
-    balloon_collection_->SetPositionPreference(
-        static_cast<BalloonCollection::PositionPreference>(
-            position_pref_.GetValue()));
-  }
+void NotificationUIManagerImpl::OnDesktopNotificationPositionChanged() {
+  balloon_collection_->SetPositionPreference(
+      static_cast<BalloonCollection::PositionPreference>(
+          position_pref_.GetValue()));
 }