Remove redundant IsFullscreenAppListEnabled()

ui/app_list/views/apps_grid_view.h

Index: ui/app_list/views/apps_grid_view.h
diff --git a/ui/app_list/views/apps_grid_view.h b/ui/app_list/views/apps_grid_view.h
index 2105597e6cab537c037fe1e877529f5db1e2b83b..932f3c962568267693a5b37ac4715bafe6fafd72 100644
--- a/ui/app_list/views/apps_grid_view.h
+++ b/ui/app_list/views/apps_grid_view.h
@@ -546,6 +546,9 @@ class APP_LIST_EXPORT AppsGridView : public views::View,
   // True if the drag_view_ item is a folder item being dragged for reparenting.
   bool dragging_for_reparent_item_;
 
+  // True if the fullscreen app list feature is enabled.
+  const bool is_fullscreen_app_list_enabled_;
+
   DISALLOW_COPY_AND_ASSIGN(AppsGridView);
 };