Reduce string copies in GURL creation

mojo/services/network/url_loader_impl.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 "mojo/services/network/url_loader_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <utility>
@@ skipping 159 matching lines @@
     SendError(net::ERR_UNEXPECTED, callback);
     return;
   }
 
   if (!request) {
     SendError(net::ERR_INVALID_ARGUMENT, callback);
     return;
   }
 
   url_request_ = context_->url_request_context()->CreateRequest(
-      GURL(request->url), net::DEFAULT_PRIORITY, this);
+      GURL(request->url.get()), net::DEFAULT_PRIORITY, this);
   url_request_->set_method(request->method);
   // TODO(jam): need to specify this policy.
   url_request_->set_referrer_policy(
       net::URLRequest::CLEAR_REFERRER_ON_TRANSITION_FROM_SECURE_TO_INSECURE);
   if (request->headers) {
     net::HttpRequestHeaders headers;
     for (size_t i = 0; i < request->headers.size(); ++i) {
       base::StringPiece header =
           request->headers[i]->name.To<base::StringPiece>();
       base::StringPiece value =
@@ skipping 226 matching lines @@
 
 void URLLoaderImpl::ListenForPeerClosed() {
   handle_watcher_.Start(response_body_stream_.get(),
                         MOJO_HANDLE_SIGNAL_PEER_CLOSED,
                         MOJO_DEADLINE_INDEFINITE,
                         base::Bind(&URLLoaderImpl::OnResponseBodyStreamClosed,
                                    base::Unretained(this)));
 }
 
 }  // namespace mojo