Convert bookmarks NTP panel to UIViewController.

ios/chrome/browser/ui/bookmarks/bookmark_controller_factory.h

 // Copyright 2014 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 IOS_CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_CONTROLLER_FACTORY_H_
 #define IOS_CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_CONTROLLER_FACTORY_H_
 
 #import <Foundation/Foundation.h>
 
 @class BookmarkHomeViewController;
+@class BookmarkHomeTabletNTPController;
 @protocol NewTabPagePanelProtocol;
 @protocol UrlLoader;
 
 namespace ios {
 class ChromeBrowserState;
 }  // namespace ios
 
 // This factory is responsible for providing an instance of a bookmark
 // controller that can browse and edit the bookmark hierarchy.
 @interface BookmarkControllerFactory : NSObject
 
 - (BookmarkHomeViewController*)
 bookmarkControllerWithBrowserState:(ios::ChromeBrowserState*)browserState
                             loader:(id<UrlLoader>)loader;
 
 // Returns an instance of a NewTabPagePanelProtocol that can navigate and edit
 // the bookmark hierarchy.
-- (id<NewTabPagePanelProtocol>)
+- (BookmarkHomeTabletNTPController*)
 bookmarkPanelControllerForBrowserState:(ios::ChromeBrowserState*)browserState
                                 loader:(id<UrlLoader>)loader
                             colorCache:(NSMutableDictionary*)cache;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_CONTROLLER_FACTORY_H_