[Download Notification] Clean Up: Initialize properties in header file

chrome/browser/download/notification/download_notification_item.cc

 // Copyright 2015 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/notification/download_notification_item.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_crx_util.h"
 #include "chrome/browser/download/download_item_model.h"
@@ skipping 53 matching lines @@
   item_->OnNotificationButtonClick(button_index);
 }
 
 std::string DownloadNotificationItem::NotificationWatcher::id() const {
   return base::UintToString(item_->item_->GetId());
 }
 
 DownloadNotificationItem::DownloadNotificationItem(content::DownloadItem* item,
                                                    Profile* profile,
                                                    Delegate* delegate)
-    : openable_(false),
-      downloading_(false),
-      image_resource_id_(0),
-      profile_(profile),
+    : profile_(profile),
       watcher_(new NotificationWatcher(this)),
       item_(item),
       delegate_(delegate) {
   item->AddObserver(this);
 
   // Notify that the instance is just created.
   delegate_->OnCreated(this);
 
   ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
 
@@ skipping 360 matching lines @@
     case content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS:
     case content::DOWNLOAD_DANGER_TYPE_MAYBE_DANGEROUS_CONTENT:
     case content::DOWNLOAD_DANGER_TYPE_USER_VALIDATED:
     case content::DOWNLOAD_DANGER_TYPE_MAX: {
       break;
     }
   }
   NOTREACHED();
   return base::string16();
 }