Use DCHECKs when observing only a single notification.

chrome/browser/chromeos/ownership/owner_settings_service_chromeos.cc

 // Copyright 2014 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/ownership/owner_settings_service_chromeos.h"
 
 #include <keyhi.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 327 matching lines @@
   CHECK(tentative_settings_->ParseFromString(policy->policy_value()));
   StorePendingChanges();
   return true;
 }
 
 void OwnerSettingsServiceChromeOS::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   DCHECK(thread_checker_.CalledOnValidThread());
-  if (type != chrome::NOTIFICATION_PROFILE_CREATED) {
-    NOTREACHED();
-    return;
-  }
+  DCHECK_EQ(chrome::NOTIFICATION_PROFILE_CREATED, type);
 
   Profile* profile = content::Source<Profile>(source).ptr();
   if (profile != profile_) {
     NOTREACHED();
     return;
   }
 
   waiting_for_profile_creation_ = false;
   ReloadKeypair();
 }
@@ skipping 454 matching lines @@
   std::vector<OnManagementSettingsSetCallback> callbacks;
   pending_management_settings_callbacks_.swap(callbacks);
   for (const auto& callback : callbacks) {
     if (!callback.is_null())
       callback.Run(success);
   }
   StorePendingChanges();
 }
 
 }  // namespace chromeos