[Mac] Remove no-op method in bookmark bar controller

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

 // 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 #include <stdint.h>
 
@@ skipping 396 matching lines @@
 
 // Returns the "off the side" button image.
 - (NSImage*)offTheSideButtonImage:(BOOL)forDarkMode;
 
 @end
 
 // Redirects from BookmarkBarBridge, the C++ object which glues us to
 // the rest of Chromium.  Internal to BookmarkBarController.
 @interface BookmarkBarController(BridgeRedirect)
 - (void)loaded:(bookmarks::BookmarkModel*)model;
-- (void)beingDeleted:(bookmarks::BookmarkModel*)model;
 - (void)nodeAdded:(bookmarks::BookmarkModel*)model
            parent:(const bookmarks::BookmarkNode*)oldParent index:(int)index;
 - (void)nodeChanged:(bookmarks::BookmarkModel*)model
                node:(const bookmarks::BookmarkNode*)node;
 - (void)nodeMoved:(bookmarks::BookmarkModel*)model
         oldParent:(const bookmarks::BookmarkNode*)oldParent
          oldIndex:(int)oldIndex
         newParent:(const bookmarks::BookmarkNode*)newParent
          newIndex:(int)newIndex;
 - (void)nodeRemoved:(bookmarks::BookmarkModel*)model
@@ skipping 29 matching lines @@
 - (int32_t)menuTagFromNodeId:(int64_t)menuid;
 - (void)updateTheme:(const ui::ThemeProvider*)themeProvider;
 - (BookmarkButton*)buttonForDroppingOnAtPoint:(NSPoint)point;
 - (BOOL)isEventAnExitEvent:(NSEvent*)event;
 - (BOOL)shrinkOrHideView:(NSView*)view forMaxX:(CGFloat)maxViewX;
 - (void)unhighlightBookmark:(const bookmarks::BookmarkNode*)node;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_CONTROLLER_H_