Use DCHECKs when observing only a single notification.

chrome/browser/download/download_request_limiter.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/download/download_request_limiter.h"
 
 #include "base/bind.h"
 #include "base/stl_util.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
@@ skipping 204 matching lines @@
       factory_(this) {}
 
 bool DownloadRequestLimiter::TabDownloadState::is_showing_prompt() const {
   return factory_.HasWeakPtrs();
 }
 
 void DownloadRequestLimiter::TabDownloadState::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
-  DCHECK(type == chrome::NOTIFICATION_WEB_CONTENT_SETTINGS_CHANGED);
+  DCHECK_EQ(chrome::NOTIFICATION_WEB_CONTENT_SETTINGS_CHANGED, type);
 
   // Content settings have been updated for our web contents, e.g. via the OIB
   // or the settings page. Check to see if the automatic downloads setting is
   // different to our internal state, and update the internal state to match if
   // necessary. If there is no content setting persisted, then retain the
   // current state and do nothing.
   //
   // NotifyCallbacks is not called as this notification should be triggered when
   // a download is not pending.
   content::WebContents* contents =
@@ skipping 230 matching lines @@
       NOTREACHED();
   }
 }
 
 void DownloadRequestLimiter::Remove(TabDownloadState* state,
                                     content::WebContents* contents) {
   DCHECK(ContainsKey(state_map_, contents));
   state_map_.erase(contents);
   delete state;
 }