Making BrowserNavigator open file browser singleton tab respecting URLs ref value

chrome/browser/extensions/file_manager_util.cc

 // Copyright (c) 2011 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/extensions/file_manager_util.h"
 
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
@@ skipping 192 matching lines @@
     return;
 
   FilePath virtual_path;
   if (!FileManagerUtil::ConvertFileToRelativeFileSystemPath(browser->profile(),
                                                             dir,
                                                             &virtual_path)) {
     return;
   }
 
   std::string url = chrome::kChromeUIFileManagerURL;
-  url += '#' + EscapeUrlEncodedData(virtual_path.value(), false);
+  url += "#/" + EscapeUrlEncodedData(virtual_path.value(), false);
 
   UserMetrics::RecordAction(UserMetricsAction("ShowFileBrowserFullTab"));
-  browser->ShowSingletonTab(GURL(url));
+  browser->ShowSingletonTabRespectRef(GURL(url));
 }
 
 void FileManagerUtil::ViewItem(const FilePath& full_path, bool enqueue) {
   std::string ext = full_path.Extension();
   // For things supported natively by the browser, we should open it
   // in a tab.
   if (IsSupportedBrowserExtension(ext.data())) {
     std::string path;
     path = "file://";
     path.append(EscapeUrlEncodedData(full_path.value(), false));
@@ skipping 64 matching lines @@
     case SelectFileDialog::SELECT_OPEN_MULTI_FILE:
       type_str = "open-multi-file";
       break;
 
     default:
       NOTREACHED();
   }
 
   return type_str;
 }