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

ios/web/public/test/http_server.mm

 // 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.
 
 #import "ios/web/public/test/http_server.h"
 
 #import <Foundation/Foundation.h>
 
 #include <string>
 
@@ skipping 150 matching lines @@
 
   GURL::Replacements replacements;
   replacements.SetHostStr(kLocalhostHost);
 
   const std::string port = std::string(
       base::IntToString(static_cast<int>(GetPort())));
   replacements.SetPortStr(port);
 
   // It is necessary to prepend the host of the input URL so that URLs such
   // as http://origin/foo, http://destination/foo can be disamgiguated.
-  const std::string new_path = std::string(result.host() + result.path());
+  const std::string new_path =
+      std::string(result.host() + result.path().as_string());
   replacements.SetPathStr(new_path);
 
   return result.ReplaceComponents(replacements);
 }
 
 scoped_refptr<RefCountedResponseProviderWrapper>
     HttpServer::GetResponseProviderForRequest(
         const web::ResponseProvider::Request& request) {
   base::AutoLock autolock(provider_list_lock_);
   scoped_refptr<RefCountedResponseProviderWrapper> result;
@@ skipping 47 matching lines @@
   port_ = port;
 }
 
 NSUInteger HttpServer::GetPort() const {
   base::AutoLock autolock(port_lock_);
   return port_;
 }
 
 } // namespace test
 } // namespace web