Reduce string copies in GURL creation

mojo/fetcher/network_fetcher.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/fetcher/network_fetcher.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 40 matching lines @@
   return url_;
 }
 
 GURL NetworkFetcher::GetRedirectURL() const {
   if (!response_)
     return GURL::EmptyGURL();
 
   if (response_->redirect_url.is_null())
     return GURL::EmptyGURL();
 
-  return GURL(response_->redirect_url);
+  return GURL(response_->redirect_url.get());
 }
 
 GURL NetworkFetcher::GetRedirectReferer() const {
   if (!response_)
     return GURL::EmptyGURL();
 
   if (response_->redirect_referrer.is_null())
     return GURL::EmptyGURL();
 
-  return GURL(response_->redirect_referrer);
+  return GURL(response_->redirect_referrer.get());
 }
 URLResponsePtr NetworkFetcher::AsURLResponse(base::TaskRunner* task_runner,
                                              uint32_t skip) {
   if (skip != 0) {
     MojoResult result = ReadDataRaw(
         response_->body.get(), nullptr, &skip,
         MOJO_READ_DATA_FLAG_ALL_OR_NONE | MOJO_READ_DATA_FLAG_DISCARD);
     DCHECK_EQ(result, MOJO_RESULT_OK);
   }
   return std::move(response_);
@@ skipping 163 matching lines @@
     loader_callback_.Run(nullptr);
     return;
   }
 
   response_ = std::move(response);
   loader_callback_.Run(std::move(owner));
 }
 
 }  // namespace fetcher
 }  // namespace mojo