Remove icon bg color for message center notifications.

chrome/browser/download/notification/download_item_notification.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_item_notification.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/files/file_util.h"
@@ skipping 174 matching lines @@
       gfx::Image(),      // icon
       message_center::NotifierId(message_center::NotifierId::SYSTEM_COMPONENT,
                                  kDownloadNotificationNotifierId),
       base::string16(),                    // display_source
       GURL(kDownloadNotificationOrigin),   // origin_url
       base::UintToString(item_->GetId()),  // tag
       message_center::RichNotificationData(), watcher()));
 
   notification_->set_progress(0);
   notification_->set_never_timeout(false);
-  notification_->set_draw_icon_background(false);
 
   Update();
 }
 
 DownloadItemNotification::~DownloadItemNotification() {
   if (image_decode_status_ == IN_PROGRESS)
     ImageDecoder::Cancel(this);
 }
 
 bool DownloadItemNotification::HasNotificationClickedListener() {
@@ skipping 729 matching lines @@
   const std::string notification_id_in_message_center = notification->id();
 
   message_center::NotificationList::Notifications visible_notifications =
       message_center_->GetVisibleNotifications();
   for (const auto& notification : visible_notifications) {
     if (notification->id() == notification_id_in_message_center)
       return true;
   }
   return false;
 }