Convert bookmarks NTP panel to UIViewController.

ios/chrome/browser/ui/ntp/new_tab_page_controller.h

Index: ios/chrome/browser/ui/ntp/new_tab_page_controller.h
diff --git a/ios/chrome/browser/ui/ntp/new_tab_page_controller.h b/ios/chrome/browser/ui/ntp/new_tab_page_controller.h
index dcbe42e1667aa86c3816e7385dc73b73d031a787..f8714c93b0390450ce4a9fb0bc50577c09df0297 100644
--- a/ios/chrome/browser/ui/ntp/new_tab_page_controller.h
+++ b/ios/chrome/browser/ui/ntp/new_tab_page_controller.h
@@ -36,6 +36,7 @@ std::string FragmentFromIdentifier(PanelIdentifier panel);
 
 }  // namespace NewTabPage
 
+@class BookmarkHomeTabletNTPController;
 @protocol CRWSwipeRecognizerProvider;
 @class GoogleLandingController;
 @protocol NewTabPagePanelProtocol;
@@ -75,7 +76,7 @@ std::string FragmentFromIdentifier(PanelIdentifier panel);
                               UIGestureRecognizerDelegate,
                               UIScrollViewDelegate> {
  @private
-  base::scoped_nsprotocol<id<NewTabPagePanelProtocol>> bookmarkController_;
+  base::scoped_nsobject<BookmarkHomeTabletNTPController> bookmarkController_;
   base::scoped_nsobject<GoogleLandingController> googleLandingController_;
   base::scoped_nsprotocol<id<NewTabPagePanelProtocol>> incognitoController_;
   // The currently visible controller, one of the above.