cros: Disable webstore search in favor of playstore

When playstore search is enabled, disable webstore search.

Bug: 751834
Change-Id: Ibcdcf7b90ae1c96debdc66854dfbc71f80c21421
Reviewed-on: https://chromium-review.googlesource.com/599067Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491534}

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

@@ -89,12 +89,13 @@ std::unique_ptr<SearchController> CreateSearchController(
       base::MakeUnique<AppSearchProvider>(
           profile, list_controller, base::MakeUnique<base::DefaultClock>(),
           model->top_level_item_list()));
-  controller->AddProvider(
-      omnibox_group_id,
-      base::MakeUnique<OmniboxProvider>(profile, list_controller));
-  controller->AddProvider(
-      webstore_group_id,
-      base::MakeUnique<WebstoreProvider>(profile, list_controller));
+  controller->AddProvider(omnibox_group_id, base::MakeUnique<OmniboxProvider>(
+                                                profile, list_controller));
+  if (!features::IsPlayStoreAppSearchEnabled()) {
+    controller->AddProvider(
+        webstore_group_id,
+        base::MakeUnique<WebstoreProvider>(profile, list_controller));
+  }
   if (features::IsAnswerCardEnabled()) {
     controller->AddProvider(
         answer_card_group_id,