Bookmark context menu "Add folder..." allows to create folder with empty name(empty string).

chrome/browser/ui/cocoa/bookmarks/bookmark_editor_base_controller.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.
 
 #include <stack>
 
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_editor_base_controller.h"
 
 #include "base/auto_reset.h"
 #include "base/logging.h"
@@ skipping 564 matching lines @@
 
 - (void)createNewFoldersForFolder:(BookmarkFolderInfo*)folderInfo
                selectedFolderInfo:(BookmarkFolderInfo*)selectedFolderInfo {
   NSArray* subfolders = [folderInfo children];
   const BookmarkNode* parentNode = [folderInfo folderNode];
   DCHECK(parentNode);
   NSUInteger i = 0;
   for (BookmarkFolderInfo* subFolderInfo in subfolders) {
     if ([subFolderInfo newFolder]) {
       BookmarkModel* model = [self bookmarkModel];
+      NSString* name = [subFolderInfo folderName];
+      if ([name length] == 0)
+      name =
+        l10n_util::GetNSStringWithFixup(IDS_BOOKMARK_EDITOR_NEW_FOLDER_NAME);
       const BookmarkNode* newFolder =
           model->AddFolder(parentNode, i,
-              base::SysNSStringToUTF16([subFolderInfo folderName]));
+              base::SysNSStringToUTF16(name));
       // Update our dictionary with the actual folder node just created.
       [subFolderInfo setFolderNode:newFolder];
       [subFolderInfo setNewFolder:NO];
     }
     [self createNewFoldersForFolder:subFolderInfo
                  selectedFolderInfo:selectedFolderInfo];
     ++i;
   }
 }
 
@@ skipping 118 matching lines @@
 }
 
 // Implementing isEqual: allows the NSTreeController to preserve the selection
 // and open/shut state of outline items when the data changes.
 - (BOOL)isEqual:(id)other {
   return [other isKindOfClass:[BookmarkFolderInfo class]] &&
       folderNode_ == [(BookmarkFolderInfo*)other folderNode];
 }
 
 @end