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

chrome/browser/ntp_snippets/fake_download_item.h

 // 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.
 
 #ifndef CHROME_BROWSER_NTP_SNIPPETS_FAKE_DOWNLOAD_ITEM_H_
 #define CHROME_BROWSER_NTP_SNIPPETS_FAKE_DOWNLOAD_ITEM_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 99 matching lines @@
   bool CanOpenDownload() override;
   bool ShouldOpenFileBasedOnExtension() override;
   bool GetOpenWhenComplete() const override;
   bool GetAutoOpened() override;
   bool GetOpened() const override;
   content::BrowserContext* GetBrowserContext() const override;
   content::WebContents* GetWebContents() const override;
   void OnContentCheckCompleted(
       content::DownloadDangerType danger_type) override;
   void SetOpenWhenComplete(bool open) override;
-  void SetOpened(bool opened) override;
   void SetDisplayName(const base::FilePath& name) override;
   std::string DebugString(bool verbose) const override;
 
  private:
   base::ObserverList<Observer> observers_;
   uint32_t id_;
   GURL url_;
   base::FilePath file_path_;
   bool is_file_externally_removed_;
   base::Time start_time_;
   base::Time end_time_;
   DownloadState download_state_;
   std::string mime_type_;
   GURL original_url_;
 
   // The members below are to be returned by methods, which return by reference.
   std::string dummy_string;
   std::vector<GURL> dummy_url_vector;
   GURL dummy_url;
   base::FilePath dummy_file_path;
 
   DISALLOW_COPY_AND_ASSIGN(FakeDownloadItem);
 };
 
 }  // namespace test
 
 #endif  // CHROME_BROWSER_NTP_SNIPPETS_FAKE_DOWNLOAD_ITEM_H_