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

chrome/browser/download/chrome_download_manager_delegate.cc

 // Copyright (c) 2012 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/chrome_download_manager_delegate.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 462 matching lines @@
 }
 
 void ChromeDownloadManagerDelegate::OpenDownload(DownloadItem* download) {
   DCHECK_EQ(DownloadItem::COMPLETE, download->GetState());
   DCHECK(!download->GetTargetFilePath().empty());
   if (!download->CanOpenDownload())
     return;
 
   if (!DownloadItemModel(download).ShouldPreferOpeningInBrowser()) {
     RecordDownloadOpenMethod(DOWNLOAD_OPEN_METHOD_DEFAULT_PLATFORM);
+    DownloadItemModel(download).SetOpenedOrShown(true);
     OpenDownloadUsingPlatformHandler(download);
     return;
   }
 
 #if !defined(OS_ANDROID)
   content::WebContents* web_contents = download->GetWebContents();
   Browser* browser =
       web_contents ? chrome::FindBrowserWithWebContents(web_contents) : NULL;
   std::unique_ptr<chrome::ScopedTabbedBrowserDisplayer> browser_displayer;
   if (!browser ||
       !browser->CanSupportWindowFeature(Browser::FEATURE_TABSTRIP)) {
     browser_displayer.reset(new chrome::ScopedTabbedBrowserDisplayer(profile_));
     browser = browser_displayer->browser();
   }
   content::OpenURLParams params(
       net::FilePathToFileURL(download->GetTargetFilePath()),
       content::Referrer(), WindowOpenDisposition::NEW_FOREGROUND_TAB,
       ui::PAGE_TRANSITION_LINK, false);
 
   if (download->GetMimeType() == "application/x-x509-user-cert")
     chrome::ShowSettingsSubPage(browser, "certificates");
   else
     browser->OpenURL(params);
 
   RecordDownloadOpenMethod(DOWNLOAD_OPEN_METHOD_DEFAULT_BROWSER);
+  DownloadItemModel(download).SetOpenedOrShown(true);
 #else
   // ShouldPreferOpeningInBrowser() should never be true on Android.
   NOTREACHED();
 #endif
 }
 
 void ChromeDownloadManagerDelegate::ShowDownloadInShell(
     DownloadItem* download) {
   if (!download->CanShowInFolder())
     return;
   base::FilePath platform_path(
       GetPlatformDownloadPath(profile_, download, PLATFORM_CURRENT_PATH));
   DCHECK(!platform_path.empty());
+  DownloadItemModel(download).SetOpenedOrShown(true);
   platform_util::ShowItemInFolder(profile_, platform_path);
 }
 
 void ChromeDownloadManagerDelegate::CheckForFileExistence(
     DownloadItem* download,
     const content::CheckForFileExistenceCallback& callback) {
 #if defined(OS_CHROMEOS)
   drive::DownloadHandler* drive_download_handler =
       drive::DownloadHandler::GetForProfile(profile_);
   if (drive_download_handler &&
@@ skipping 282 matching lines @@
       path.MatchesExtension(FILE_PATH_LITERAL(".xht")) ||
       path.MatchesExtension(FILE_PATH_LITERAL(".xhtm")) ||
       path.MatchesExtension(FILE_PATH_LITERAL(".xhtml")) ||
       path.MatchesExtension(FILE_PATH_LITERAL(".xsl")) ||
       path.MatchesExtension(FILE_PATH_LITERAL(".xslt"))) {
     return true;
   }
 #endif
   return false;
 }