Use EnablePlayStoreAppSearch feature flag.

ui/app_list/views/search_result_tile_item_view.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 UI_APP_LIST_VIEWS_SEARCH_RESULT_TILE_ITEM_VIEW_H_
 #define UI_APP_LIST_VIEWS_SEARCH_RESULT_TILE_ITEM_VIEW_H_
 
+#include <memory>
+
 #include "base/macros.h"
 #include "ui/app_list/search_result_observer.h"
 #include "ui/app_list/views/tile_item_view.h"
 #include "ui/views/context_menu_controller.h"
 
 namespace views {
 class MenuRunner;
 class Label;
 }
 
@@ skipping 48 matching lines @@
 
   // Owned by the model provided by the AppListViewDelegate.
   SearchResult* item_ = nullptr;
 
   views::Label* rating_ = nullptr;  // Owned by views hierarchy.
   views::Label* price_ = nullptr;   // Owned by views hierarchy.
   views::ImageView* rating_star_ = nullptr;  // Owned by views hierarchy.
 
   AppListViewDelegate* view_delegate_;
 
-  const bool is_fullscreen_app_list_enabled_;
+  // Whether the Play Store app search feature is enabled.
+  const bool is_play_store_app_search_enabled_;
 
   std::unique_ptr<views::MenuRunner> context_menu_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchResultTileItemView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_SEARCH_RESULT_TILE_ITEM_VIEW_H_