Show tooltips for nested folders in the bookmark bar.

chrome/browser/ui/cocoa/bookmarks/bookmark_menu_cocoa_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.
 
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_menu_cocoa_controller.h"
 
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"  // IDC_BOOKMARK_MENU
 #import "chrome/browser/app_controller_mac.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 25 matching lines @@
 @implementation BookmarkMenuCocoaController
 
 + (NSString*)menuTitleForNode:(const BookmarkNode*)node {
   base::string16 title = [MenuController elideMenuTitle:node->GetTitle()
                                           toWidth:kMaximumMenuPixelsWide];
   return base::SysUTF16ToNSString(title);
 }
 
 + (NSString*)tooltipForNode:(const BookmarkNode*)node {
   NSString* title = base::SysUTF16ToNSString(node->GetTitle());
+  if (node->is_folder())
+    return title;
   std::string urlString = node->url().possibly_invalid_spec();
   NSString* url = base::SysUTF8ToNSString(urlString);
   return cocoa_l10n_util::TooltipForURLAndTitle(url, title);
 }
 
 - (id)initWithBridge:(BookmarkMenuBridge*)bridge
              andMenu:(NSMenu*)menu {
   if ((self = [super init])) {
     bridge_ = bridge;
     DCHECK(bridge_);
@@ skipping 98 matching lines @@
 
 - (IBAction)openAllBookmarksNewWindow:(id)sender {
   [self openAll:[sender tag] withDisposition:NEW_WINDOW];
 }
 
 - (IBAction)openAllBookmarksIncognitoWindow:(id)sender {
   [self openAll:[sender tag] withDisposition:OFF_THE_RECORD];
 }
 
 @end  // BookmarkMenuCocoaController