[MD Bookmarks] Fix singleton tab behavior.

chrome/browser/ui/bookmarks/bookmark_context_menu_controller.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.
 
 #include "chrome/browser/ui/bookmarks/bookmark_context_menu_controller.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
@@ skipping 255 matching lines @@
     case IDC_BOOKMARK_BAR_SHOW_MANAGED_BOOKMARKS: {
       PrefService* prefs = profile_->GetPrefs();
       prefs->SetBoolean(
           bookmarks::prefs::kShowManagedBookmarksInBookmarkBar,
           !prefs->GetBoolean(
               bookmarks::prefs::kShowManagedBookmarksInBookmarkBar));
       break;
     }
 
     case IDC_BOOKMARK_MANAGER: {
-      base::RecordAction(UserMetricsAction("ShowBookmarkManager"));
       if (selection_.size() != 1)
         chrome::ShowBookmarkManager(browser_);
       else if (selection_[0]->is_folder())
         chrome::ShowBookmarkManagerForNode(browser_, selection_[0]->id());
       else if (parent_)
         chrome::ShowBookmarkManagerForNode(browser_, parent_->id());
       else
         chrome::ShowBookmarkManager(browser_);
       break;
     }
@@ skipping 149 matching lines @@
     return !managed->managed_node()->empty();
   }
 
   return true;
 }
 
 void BookmarkContextMenuController::BookmarkModelChanged() {
   if (delegate_)
     delegate_->CloseMenu();
 }