Use DCHECKs when observing only a single notification.

chrome/browser/chromeos/app_mode/startup_app_launcher.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/app_mode/startup_app_launcher.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/json/json_file_value_serializer.h"
@@ skipping 293 matching lines @@
   }
   registrar_.Remove(this, extensions::NOTIFICATION_EXTENSION_UPDATE_FOUND,
                     content::NotificationService::AllSources());
 
   MaybeLaunchApp();
 }
 
 void StartupAppLauncher::Observe(int type,
                                  const content::NotificationSource& source,
                                  const content::NotificationDetails& details) {
-  DCHECK(type == extensions::NOTIFICATION_EXTENSION_UPDATE_FOUND);
-  typedef const std::pair<std::string, Version> UpdateDetails;
+  DCHECK_EQ(extensions::NOTIFICATION_EXTENSION_UPDATE_FOUND, type);
+  using UpdateDetails = const std::pair<std::string, Version>;
   const std::string& id = content::Details<UpdateDetails>(details)->first;
   const Version& version = content::Details<UpdateDetails>(details)->second;
   VLOG(1) << "Found extension update id=" << id
-      << " version=" << version.GetString();
+          << " version=" << version.GetString();
   extension_update_found_ = true;
 }
 
 void StartupAppLauncher::OnFinishCrxInstall(const std::string& extension_id,
                                             bool success) {
   // Wait for pending updates or dependent extensions to download.
   if (extensions::ExtensionSystem::Get(profile_)
           ->extension_service()
           ->pending_extension_manager()
           ->HasPendingExtensions()) {
@@ skipping 226 matching lines @@
   // Skip copying meta data from the current installed primary app when
   // there is a pending update.
   if (PrimaryAppHasPendingUpdate())
     return;
 
   KioskAppManager::Get()->ClearAppData(app_id_);
   KioskAppManager::Get()->UpdateAppDataFromProfile(app_id_, profile_, NULL);
 }
 
 }   // namespace chromeos