[Mac] Delete more bookmark bar folder code. This removes things that were missed last time.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_button_cell.h

-// 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.
-
-#ifndef CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_FOLDER_BUTTON_CELL_H_
-#define CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_FOLDER_BUTTON_CELL_H_
-#pragma once
-
-#import "chrome/browser/ui/cocoa/bookmarks/bookmark_button_cell.h"
-
-class BookmarkNode;
-
-// A button cell that handles drawing/highlighting of buttons in the
-// bookmark bar.  This cell forwards mouseEntered/mouseExited events
-// to its control view so that pseudo-menu operations
-// (e.g. hover-over to open) can be implemented.
-@interface BookmarkBarFolderButtonCell : BookmarkButtonCell {
- @private
-  scoped_nsobject<NSColor> frameColor_;
-}
-
-// Create a button cell which draws without a theme and with a frame
-// color provided by the ThemeService defaults.
-+ (id)buttonCellForNode:(const BookmarkNode*)node
-            contextMenu:(NSMenu*)contextMenu
-               cellText:(NSString*)cellText
-              cellImage:(NSImage*)cellImage;
-
-@end
-
-#endif  // CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_FOLDER_BUTTON_CELL_H_