Use DCHECKs when observing only a single notification.

chrome/browser/chromeos/drive/drive_integration_service.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/chromeos/drive/drive_integration_service.h"
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/macros.h"
 #include "base/strings/stringprintf.h"
@@ skipping 547 matching lines @@
     pref_service->SetFilePath(
         ::prefs::kDownloadDefaultDirectory,
         file_manager::util::GetDownloadsFolderForProfile(profile_));
   }
 }
 
 void DriveIntegrationService::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
-  if (type == chrome::NOTIFICATION_PROFILE_CREATED) {
-    Profile* created_profile = content::Source<Profile>(source).ptr();
-    if (created_profile->IsOffTheRecord() &&
-        created_profile->IsSameProfile(profile_)) {
-      download_handler_->ObserveIncognitoDownloadManager(
-          BrowserContext::GetDownloadManager(created_profile));
-    }
+  DCHECK_EQ(chrome::NOTIFICATION_PROFILE_CREATED, type);
+  Profile* created_profile = content::Source<Profile>(source).ptr();
+  if (created_profile->IsOffTheRecord() &&
+      created_profile->IsSameProfile(profile_)) {
+    download_handler_->ObserveIncognitoDownloadManager(
+        BrowserContext::GetDownloadManager(created_profile));
   }
 }
 
 //===================== DriveIntegrationServiceFactory =======================
 
 DriveIntegrationServiceFactory::FactoryCallback*
     DriveIntegrationServiceFactory::factory_for_test_ = NULL;
 
 DriveIntegrationServiceFactory::ScopedFactoryForTest::ScopedFactoryForTest(
     FactoryCallback* factory_for_test) {
@@ skipping 57 matching lines @@
         profile, preference_watcher,
         NULL, std::string(), base::FilePath(), NULL);
   } else {
     service = factory_for_test_->Run(profile);
   }
 
   return service;
 }
 
 }  // namespace drive