Use EnablePlayStoreAppSearch feature flag.

chrome/browser/ui/app_list/search/search_controller_factory.cc

 // 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.
 
 #include "chrome/browser/ui/app_list/search/search_controller_factory.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
@@ skipping 103 matching lines @@
   // session and running on Chrome OS.
   if (app_list::switches::IsDriveSearchInChromeLauncherEnabled() &&
       !profile->IsGuestSession()) {
     size_t search_api_group_id =
         controller->AddGroup(kMaxLauncherSearchResults, 1.0);
     controller->AddProvider(search_api_group_id,
                             base::MakeUnique<LauncherSearchProvider>(profile));
   }
 
 #if defined(OS_CHROMEOS)
-  size_t playstore_api_group_id =
-      controller->AddGroup(kMaxPlayStoreResults, 1.0);
-  controller->AddProvider(playstore_api_group_id,
-                          base::MakeUnique<ArcPlayStoreSearchProvider>(
-                              kMaxPlayStoreResults, profile, list_controller));
+  if (features::IsPlayStoreAppSearchEnabled()) {
+    size_t playstore_api_group_id =
+        controller->AddGroup(kMaxPlayStoreResults, 1.0);
+    controller->AddProvider(
+        playstore_api_group_id,
+        base::MakeUnique<ArcPlayStoreSearchProvider>(kMaxPlayStoreResults,
+                                                     profile, list_controller));
+  }
 #endif
   return controller;
 }
 
 }  // namespace app_list