Reduce string copies in GURL creation

mojo/shell/package_manager/content_handler_unittest.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 <stdint.h>
 
 #include <utility>
 
 #include "base/at_exit.h"
 #include "base/bind.h"
@@ skipping 128 matching lines @@
   ~TestPackageManagerImpl() override {}
 
   void set_mime_type(const std::string& mime_type) {
     mime_type_ = mime_type;
   }
 
   // PackageManagerImpl:
   void FetchRequest(
       URLRequestPtr request,
       const Fetcher::FetchCallback& loader_callback) override {
-    new TestFetcher(loader_callback, GURL(request->url), mime_type_);
+    new TestFetcher(loader_callback, GURL(request->url.get()), mime_type_);
   }
 
  private:
   std::string mime_type_;
 
   DISALLOW_COPY_AND_ASSIGN(TestPackageManagerImpl);
 };
 
 }  // namespace
 
@@ skipping 155 matching lines @@
   params->SetTargetURL(GURL("test:test"));
   params->set_connect_callback(
       [&content_handler_id](uint32_t t) { content_handler_id = t; });
   application_manager_->ConnectToApplication(std::move(params));
   EXPECT_EQ(0u, content_handler_id);
 }
 
 }  // namespace test
 }  // namespace package_manager
 }  // namespace mojo