Uses WeakPtrFactory instead of base::Unretained.

ash/system/ime/tray_ime.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 "ash/system/ime/tray_ime.h"
 
 #include <vector>
 
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/root_window_controller.h"
@@ skipping 172 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(IMEDetailedView);
 };
 
 }  // namespace tray
 
 TrayIME::TrayIME(SystemTray* system_tray)
     : SystemTrayItem(system_tray),
       tray_label_(NULL),
       default_(NULL),
       detailed_(NULL),
-      message_shown_(false) {
+      message_shown_(false),
+      weak_factory_(this) {
   Shell::GetInstance()->system_tray_notifier()->AddIMEObserver(this);
 }
 
 TrayIME::~TrayIME() {
   Shell::GetInstance()->system_tray_notifier()->RemoveIMEObserver(this);
   message_center::MessageCenter::Get()->RemoveNotification(
       kIMENotificationId, false /* by_user */);
 }
 
 void TrayIME::UpdateTrayLabel(const IMEInfo& current, size_t count) {
@@ skipping 32 matching lines @@
           current.medium_name),
       base::string16(),  // message
       bundle.GetImageNamed(IDR_AURA_UBER_TRAY_IME),
       base::string16(),  // display_source
       message_center::NotifierId(
           message_center::NotifierId::SYSTEM_COMPONENT,
           system_notifier::kNotifierInputMethod),
       message_center::RichNotificationData(),
       new message_center::HandleNotificationClickedDelegate(
           base::Bind(&TrayIME::PopupDetailedView,
-                     base::Unretained(this), 0, true))));
+                     weak_factory_.GetWeakPtr(), 0, true))));
   message_center->AddNotification(notification.Pass());
   message_shown_ = true;
 }
 
 views::View* TrayIME::CreateTrayView(user::LoginStatus status) {
   CHECK(tray_label_ == NULL);
   tray_label_ = new TrayItemView(this);
   tray_label_->CreateLabel();
   SetupLabelForTray(tray_label_->label());
   // Hide IME tray when it is created, it will be updated when it is notified
@@ skipping 56 matching lines @@
     default_->UpdateLabel(current);
   if (detailed_)
     detailed_->Update(list, property_list);
 
   if (list.size() > 1 && show_message)
     UpdateOrCreateNotification();
 }
 
 }  // namespace internal
 }  // namespace ash