[MD Bookmarks] Fix singleton tab behavior.

chrome/browser/app_controller_mac.mm

 // 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.
 
 #import "chrome/browser/app_controller_mac.h"
 
 #include <stddef.h>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 999 matching lines @@
     }
     case IDC_IMPORT_SETTINGS: {
       if (Browser* browser = ActivateBrowser(lastProfile)) {
         chrome::ShowImportDialog(browser);
       } else {
         chrome::OpenImportSettingsDialogWindow(lastProfile);
       }
       break;
     }
     case IDC_SHOW_BOOKMARK_MANAGER:
-      base::RecordAction(UserMetricsAction("ShowBookmarkManager"));
       if (Browser* browser = ActivateBrowser(lastProfile)) {
         chrome::ShowBookmarkManager(browser);
       } else {
         // No browser window, so create one for the bookmark manager tab.
         chrome::OpenBookmarkManagerWindow(lastProfile);
       }
       break;
     case IDC_SHOW_HISTORY:
       if (Browser* browser = ActivateBrowser(lastProfile))
         chrome::ShowHistory(browser);
@@ skipping 586 matching lines @@
 
 //---------------------------------------------------------------------------
 
 namespace app_controller_mac {
 
 bool IsOpeningNewWindow() {
   return g_is_opening_new_window;
 }
 
 }  // namespace app_controller_mac