Reduce string copies in GURL creation

mojo/shell/package_manager/package_manager_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 "mojo/shell/package_manager/package_manager_impl.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 54 matching lines @@
       std::make_pair(content_handler_package, qualifier);
 }
 
 void PackageManagerImpl::SetApplicationManager(ApplicationManager* manager) {
   application_manager_ = manager;
 }
 
 void PackageManagerImpl::FetchRequest(
     URLRequestPtr request,
     const Fetcher::FetchCallback& loader_callback) {
-  GURL url(request->url);
+  GURL url(request->url.get());
   if (url.SchemeIs(AboutFetcher::kAboutScheme)) {
     AboutFetcher::Start(url, loader_callback);
     return;
   }
 
   if (url.SchemeIs(url::kDataScheme)) {
     DataFetcher::Start(url, loader_callback);
     return;
   }
 
@@ skipping 132 matching lines @@
 void PackageManagerImpl::OnContentHandlerConnectionClosed(
     ContentHandlerConnection* connection) {
   // Remove the mapping.
   auto it = identity_to_content_handler_.find(connection->identity());
   DCHECK(it != identity_to_content_handler_.end());
   identity_to_content_handler_.erase(it);
 }
 
 }  // namespace shell
 }  // namespace mojo