Use DCHECKs when observing only a single notification.

chrome/browser/spellchecker/spellcheck_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/spellchecker/spellcheck_service.h"
 
 #include <set>
 
 #include "base/logging.h"
 #include "base/strings/string_split.h"
@@ skipping 244 matching lines @@
 }
 
 bool SpellcheckService::UnloadExternalDictionary(
     const std::string& /* path */) {
   return false;
 }
 
 void SpellcheckService::Observe(int type,
                                 const content::NotificationSource& source,
                                 const content::NotificationDetails& details) {
-  DCHECK(type == content::NOTIFICATION_RENDERER_PROCESS_CREATED);
-  content::RenderProcessHost* process =
-      content::Source<content::RenderProcessHost>(source).ptr();
-  InitForRenderer(process);
+  DCHECK_EQ(content::NOTIFICATION_RENDERER_PROCESS_CREATED, type);
+  InitForRenderer(content::Source<content::RenderProcessHost>(source).ptr());
 }
 
 void SpellcheckService::OnCustomDictionaryLoaded() {
   InitForAllRenderers();
 }
 
 void SpellcheckService::OnCustomDictionaryChanged(
     const SpellcheckCustomDictionary::Change& dictionary_change) {
   for (content::RenderProcessHost::iterator i(
           content::RenderProcessHost::AllHostsIterator());
@@ skipping 99 matching lines @@
   chrome::spellcheck_common::GetISOLanguageCountryCodeFromLocale(
       feedback_language, &language_code, &country_code);
   feedback_sender_->OnLanguageCountryChange(language_code, country_code);
   if (SpellingServiceClient::IsAvailable(
           context_, SpellingServiceClient::SPELLCHECK)) {
     feedback_sender_->StartFeedbackCollection();
   } else {
     feedback_sender_->StopFeedbackCollection();
   }
 }