mac: Minor tweaks to notifications code.

ui/message_center/cocoa/popup_collection.mm

 // Copyright (c) 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.
 
 #import "ui/message_center/cocoa/popup_collection.h"
 
 #import "ui/message_center/cocoa/notification_controller.h"
 #import "ui/message_center/cocoa/popup_controller.h"
 #include "ui/message_center/message_center.h"
 #include "ui/message_center/message_center_constants.h"
@@ skipping 33 matching lines @@
         popup_collection_(popup_collection) {
     message_center_->AddObserver(this);
   }
 
   virtual ~PopupCollectionObserver() {
     message_center_->RemoveObserver(this);
   }
 
   virtual void OnNotificationAdded(
       const std::string& notification_id) OVERRIDE {
-    const auto& popups = message_center_->GetPopupNotifications();
-    for (auto it = popups.begin(); it != popups.end(); ++it) {
-      if ((*it)->id() == notification_id) {
-        [popup_collection_ addNotification:*it];
+    for (const auto& notification : message_center_->GetPopupNotifications()) {
+      if (notification->id() == notification_id) {
+        [popup_collection_ addNotification:notification];
         return;
       }
     }
   }
 
   virtual void OnNotificationRemoved(const std::string& notification_id,
                                      bool user_id) OVERRIDE {
     [popup_collection_ removeNotification:notification_id];
   }
 
@@ skipping 189 matching lines @@
         // If there's no room left on screen to display notifications, stop
         // trying.
         if (![self addNotification:*it])
           break;
       }
     }
   }
 }
 
 @end