Reduce string copies in GURL creation

mandoline/services/updater/updater_impl.cc

 // Copyright 2015 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 "mandoline/services/updater/updater_impl.h"
 
 #include <utility>
 
 #include "base/files/file_util.h"
 #include "base/path_service.h"
@@ skipping 13 matching lines @@
 UpdaterImpl::~UpdaterImpl() {
 }
 
 void UpdaterImpl::GetPathForApp(
     const mojo::String& url,
     const Updater::GetPathForAppCallback& callback) {
   // TODO(scottmg): For now, just stub to local files. This will become an
   // integration with components/update_client.
   base::FilePath shell_dir;
   PathService::Get(base::DIR_MODULE, &shell_dir);
-  const GURL as_url(url);
+  const GURL as_url(url.get());
   const base::FilePath path = shell_dir.Append(base::FilePath::FromUTF8Unsafe(
       as_url.path().substr(2, as_url.path().size() - 3) + ".mojo"));
   callback.Run(path.AsUTF8Unsafe());
 }
 
 }  // namespace updater