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

chrome/browser/platform_util_internal.h

 // 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.
 
 #ifndef CHROME_BROWSER_PLATFORM_UTIL_INTERNAL_H_
 #define CHROME_BROWSER_PLATFORM_UTIL_INTERNAL_H_
 
 #include "chrome/browser/platform_util.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace platform_util {
 namespace internal {
 
 // Called by platform_util.cc on desktop platforms to invoke platform specific
 // logic to open |path| using a suitable handler. |path| has been verified to be
 // of type |type|.
 // Always called on the blocking pool.
 void PlatformOpenVerifiedItem(const base::FilePath& path, OpenItemType type);
 
+// Called by platform_util.cc on desktop platforms to invoke platform specific
+// logic to open the folder containing the item specified by |full_path| in the
+// desktop's default manner.
+void PlatformShowItemInFolder(Profile* profile,
+                              const base::FilePath& full_path);
+
 // Prevent shell or external applications from being invoked during testing.
 void DisableShellOperationsForTesting();
 
 }  // namespace internal
 }  // namespace platform_util
 
 #endif  // CHROME_BROWSER_PLATFORM_UTIL_INTERNAL_H_