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

chrome/browser/download/notification/download_notification_item.h

 // 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.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_NOTIFICATION_DOWNLOAD_NOTIFICATION_ITEM_H_
 #define CHROME_BROWSER_DOWNLOAD_NOTIFICATION_DOWNLOAD_NOTIFICATION_ITEM_H_
 
 #include "chrome/browser/download/notification/download_notification_item.h"
 
 #include "base/strings/string_number_conversions.h"
@@ skipping 83 matching lines @@
 
   // Returns a short one-line status string for a download command.
   base::string16 GetCommandLabel(DownloadCommands::Command command) const;
 
   // Get the warning test to notify a dangerous download. Should only be called
   // if IsDangerous() is true.
   base::string16 GetWarningText() const;
 
   scoped_ptr<std::vector<DownloadCommands::Command>> GetPossibleActions() const;
 
-  bool openable_;
-  bool downloading_;
-  int image_resource_id_;
+  bool openable_ = false;
+  bool downloading_ = false;
+  int image_resource_id_ = 0;
   Profile* profile_;
   scoped_refptr<NotificationWatcher> watcher_;
-
   scoped_ptr<Notification> notification_;
-
   content::DownloadItem* item_;
   scoped_ptr<std::vector<DownloadCommands::Command>> button_actions_;
-
   Delegate* const delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadNotificationItem);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_NOTIFICATION_DOWNLOAD_NOTIFICATION_ITEM_H_