Use DCHECKs when observing only a single notification.

chrome/browser/chromeos/policy/recommendation_restorer.cc

 // Copyright 2013 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/chromeos/policy/recommendation_restorer.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/logging.h"
@@ skipping 59 matching lines @@
 void RecommendationRestorer::Shutdown() {
   StopTimer();
   pref_change_registrar_.RemoveAll();
   notification_registrar_.RemoveAll();
 }
 
 void RecommendationRestorer::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
-  if (type == chrome::NOTIFICATION_LOGIN_USER_CHANGED) {
-    logged_in_ = true;
-    notification_registrar_.RemoveAll();
-    StopTimer();
-    RestoreAll();
-  } else {
-    NOTREACHED();
-  }
+  DCHECK_EQ(chrome::NOTIFICATION_LOGIN_USER_CHANGED, type);
+
+  logged_in_ = true;
+  notification_registrar_.RemoveAll();
+  StopTimer();
+  RestoreAll();
 }
 
 void RecommendationRestorer::OnUserActivity(const ui::Event* event) {
   if (restore_timer_.IsRunning())
     restore_timer_.Reset();
 }
 
 void RecommendationRestorer::Restore(bool allow_delay,
                                      const std::string& pref_name) {
   const PrefService::Preference* pref =
@@ skipping 56 matching lines @@
                                   base::Unretained(this)));
 }
 
 void RecommendationRestorer::StopTimer() {
   restore_timer_.Stop();
   if (ui::UserActivityDetector::Get())
     ui::UserActivityDetector::Get()->RemoveObserver(this);
 }
 
 }  // namespace policy