[WIP] make GURL::path() return a StringPiece

chrome/browser/ui/webui/extensions/chromeos/kiosk_apps_handler.cc

 // Copyright 2013 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/webui/extensions/chromeos/kiosk_apps_handler.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 71 matching lines @@
   GURL webstore_base_url =
       GURL(extension_urls::GetWebstoreItemDetailURLPrefix());
 
   if (webstore_url.scheme() != webstore_base_url.scheme() ||
       webstore_url.host() != webstore_base_url.host() ||
       !base::StartsWith(webstore_url.path(), webstore_base_url.path(),
                         base::CompareCase::SENSITIVE)) {
     return false;
   }
 
-  const std::string path = webstore_url.path();
+  const base::StringPiece path = webstore_url.path();
   const size_t last_slash = path.rfind('/');
   if (last_slash == std::string::npos)
     return false;
 
-  const std::string candidate_id = path.substr(last_slash + 1);
+  const std::string candidate_id = path.substr(last_slash + 1).as_string();
   if (!crx_file::id_util::IdIsValid(candidate_id))
     return false;
 
   *app_id = candidate_id;
   return true;
 }
 
 }  // namespace
 
 KioskAppsHandler::KioskAppsHandler(OwnerSettingsServiceChromeOS* service)
@@ skipping 250 matching lines @@
 
 void KioskAppsHandler::ShowError(const std::string& app_id) {
   base::StringValue app_id_value(app_id);
   web_ui()->CallJavascriptFunctionUnsafe(
       "extensions.KioskAppsOverlay.showError", app_id_value);
 
   kiosk_app_manager_->RemoveApp(app_id, owner_settings_service_);
 }
 
 }  // namespace chromeos