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

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_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_bar_controller.h"
 
 #include <stddef.h>
 
 #import "base/mac/bundle_locations.h"
 #import "base/mac/foundation_util.h"
@@ skipping 2290 matching lines @@
   [self createSupervisedBookmarksButton];
   [self addNodesToButtonList:node];
   [self createOtherBookmarksButton];
   [self updateTheme:[[[self view] window] themeProvider]];
   [self positionRightSideButtons];
   [self addButtonsToView];
   [self configureOffTheSideButtonContentsAndVisibility];
   [self reconfigureBookmarkBar];
 }
 
-- (void)beingDeleted:(BookmarkModel*)model {
-  // The browser may be being torn down; little is safe to do.  As an
-  // example, it may not be safe to clear the pasteboard.
-  // http://crbug.com/38665
-}
-
 - (void)nodeAdded:(BookmarkModel*)model
            parent:(const BookmarkNode*)newParent index:(int)newIndex {
   // If a context menu is open, close it.
   [self cancelMenuTracking];
 
   const BookmarkNode* newNode = newParent->GetChild(newIndex);
   id<BookmarkButtonControllerProtocol> newController =
       [self controllerForNode:newParent];
   [newController addButtonForNode:newNode atIndex:newIndex];
   // If we go from 0 --> 1 bookmarks we may need to hide the
@@ skipping 626 matching lines @@
 - (id<BookmarkButtonControllerProtocol>)controllerForNode:
     (const BookmarkNode*)node {
   // See if it's in the bar, then if it is in the hierarchy of visible
   // folder menus.
   if (bookmarkModel_->bookmark_bar_node() == node)
     return self;
   return [folderController_ controllerForNode:node];
 }
 
 @end