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

chrome/browser/extensions/api/downloads/downloads_api_browsertest.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.
 
 // Disable everything on windows only. http://crbug.com/306144
 #ifndef OS_WIN
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 11 matching lines @@
 #include "build/build_config.h"
 #include "chrome/browser/download/download_file_icon_extractor.h"
 #include "chrome/browser/download/download_service.h"
 #include "chrome/browser/download/download_service_factory.h"
 #include "chrome/browser/download/download_test_file_activity_observer.h"
 #include "chrome/browser/extensions/api/downloads/downloads_api.h"
 #include "chrome/browser/extensions/browser_action_test_util.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_function_test_utils.h"
 #include "chrome/browser/net/url_request_mock_util.h"
+#include "chrome/browser/platform_util_internal.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/common/extensions/api/downloads.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "components/prefs/pref_service.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 276 matching lines @@
     InProcessBrowserTest::SetUpOnMainThread();
     GoOnTheRecord();
     CreateAndSetDownloadsDirectory();
     current_browser()->profile()->GetPrefs()->SetBoolean(
         prefs::kPromptForDownload, false);
     GetOnRecordManager()->RemoveAllDownloads();
     events_listener_.reset(new DownloadsEventsListener());
     // Disable file chooser for current profile.
     DownloadTestFileActivityObserver observer(current_browser()->profile());
     observer.EnableFileChooser(false);
+    // Prevent platform from opening files and showing folders.
+    platform_util::internal::DisableShellOperationsForTesting();
   }
 
   void GoOnTheRecord() { current_browser_ = browser(); }
 
   void GoOffTheRecord() {
     if (!incognito_browser_) {
       incognito_browser_ = CreateIncognitoBrowser();
       GetOffRecordManager()->RemoveAllDownloads();
       // Disable file chooser for incognito profile.
       DownloadTestFileActivityObserver observer(incognito_browser_->profile());
@@ skipping 3965 matching lines @@
   EXPECT_EQ(downloads::FILENAME_CONFLICT_ACTION_PROMPT, conflict_action);
   EXPECT_FALSE(warnings.empty());
   EXPECT_EQ(Warning::kDownloadFilenameConflict,
             warnings.begin()->warning_type());
   EXPECT_EQ("incumbent", warnings.begin()->extension_id());
 }
 
 }  // namespace extensions
 
 #endif  // http://crbug.com/306144