Don't return installed apps in webstore searches in Launcher

chrome/browser/ui/app_list/search/webstore/webstore_result.h

Index: chrome/browser/ui/app_list/search/webstore/webstore_result.h
diff --git a/chrome/browser/ui/app_list/search/webstore/webstore_result.h b/chrome/browser/ui/app_list/search/webstore/webstore_result.h
index 7b1551aee4caf08586218f0bff7b2a691445027e..b7bd296ede42292b313620e332145fa7b1b4a47b 100644
--- a/chrome/browser/ui/app_list/search/webstore/webstore_result.h
+++ b/chrome/browser/ui/app_list/search/webstore/webstore_result.h
@@ -38,6 +38,9 @@ class WebstoreResult : public SearchResult,
                  AppListControllerDelegate* controller);
   ~WebstoreResult() override;
 
+  static std::string GetResultIdFromExtensionId(
+      const std::string& extension_id);
+
   const std::string& app_id() const { return app_id_; }
   const GURL& icon_url() const { return icon_url_; }
   extensions::Manifest::Type item_type() const { return item_type_; }