Download shelf autohides on showing in shell, just same as regular open

chrome/browser/ntp_snippets/fake_download_item.cc

 // Copyright 2016 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/ntp_snippets/fake_download_item.h"
 
 #include "base/bind.h"
 
 using content::DownloadItem;
 
@@ skipping 353 matching lines @@
 
 void FakeDownloadItem::OnContentCheckCompleted(
     content::DownloadDangerType danger_type) {
   NOTREACHED();
 }
 
 void FakeDownloadItem::SetOpenWhenComplete(bool open) {
   NOTREACHED();
 }
 
-void FakeDownloadItem::SetOpened(bool opened) {
-  NOTREACHED();
-}
-
 void FakeDownloadItem::SetDisplayName(const base::FilePath& name) {
   NOTREACHED();
 }
 
 std::string FakeDownloadItem::DebugString(bool verbose) const {
   NOTREACHED();
   return std::string();
 }
 
 }  // namespace test