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

chrome/browser/chromeos/app_mode/fake_cws.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/chromeos/app_mode/fake_cws.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 173 matching lines @@
 
   *update_check_content = kUpdateContentTemplate;
   base::ReplaceSubstringsAfterOffset(update_check_content, 0, "$APPS",
                                      apps_content);
   return true;
 }
 
 std::unique_ptr<HttpResponse> FakeCWS::HandleRequest(
     const HttpRequest& request) {
   GURL request_url = GURL("http://localhost").Resolve(request.relative_url);
-  std::string request_path = request_url.path();
-  if (request_path.find(update_check_end_point_) != std::string::npos &&
+  base::StringPiece request_path = request_url.path();
+  if (request_path.find(update_check_end_point_) != base::StringPiece::npos &&
       !id_to_update_check_content_map_.empty()) {
     std::vector<std::string> ids;
     if (GetAppIdsFromUpdateUrl(request_url, &ids)) {
       std::string update_check_content;
       if (GetUpdateCheckContent(ids, &update_check_content)) {
         ++update_check_count_;
         std::unique_ptr<BasicHttpResponse> http_response(
             new BasicHttpResponse());
         http_response->set_code(net::HTTP_OK);
         http_response->set_content_type("text/xml");
         http_response->set_content(update_check_content);
         return std::move(http_response);
       }
     }
   }
 
   return std::unique_ptr<HttpResponse>();
 }
 
 }  // namespace chromeos