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

chrome/browser/platform_util.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/platform_util.h"
 
 #include "base/files/file.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "chrome/browser/platform_util_internal.h"
@@ skipping 44 matching lines @@
 void OpenItem(Profile* profile,
               const base::FilePath& full_path,
               OpenItemType item_type,
               const OpenOperationCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   BrowserThread::PostBlockingPoolTask(
       FROM_HERE, base::Bind(&VerifyAndOpenItemOnBlockingThread, full_path,
                             item_type, callback));
 }
 
+void ShowItemInFolder(Profile* profile, const base::FilePath& full_path) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  if (shell_operations_allowed)
+    internal::PlatformShowItemInFolder(profile, full_path);
+}
+
 }  // namespace platform_util