Rename ArcCustomNotificationView to ArcNotificationContentView

ui/arc/notification/arc_notification_view.h

Index: ui/arc/notification/arc_notification_view.h
diff --git a/ui/arc/notification/arc_notification_view.h b/ui/arc/notification/arc_notification_view.h
index f82651e7d20968b272efa4abef013b99c2862f0b..838432718ce314cde2765fd4de453d64d3185ef4 100644
--- a/ui/arc/notification/arc_notification_view.h
+++ b/ui/arc/notification/arc_notification_view.h
@@ -17,7 +17,7 @@ namespace arc {
 class ArcNotificationContentViewDelegate;
 
 // View for custom notification with NOTIFICATION_TYPE_CUSTOM which hosts the
-// ArcCustomNotificationView which shows content of the notification.
+// ArcNotificationContentView which shows content of the notification.
 class ArcNotificationView : public message_center::MessageView {
  public:
   static const char kViewClassName[];