Reduce string copies in GURL creation

mandoline/ui/desktop_ui/browser_manager.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/ui/desktop_ui/browser_manager.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "components/mus/public/cpp/window.h"
@@ skipping 28 matching lines @@
   DCHECK_GT(browsers_.count(browser), 0u);
   browsers_.erase(browser);
   if (browsers_.empty())
     app_->Quit();
 }
 
 void BrowserManager::LaunchURL(const mojo::String& url) {
   DCHECK(!browsers_.empty());
   // TODO(fsamuel): Create a new Browser once we support multiple browser
   // windows.
-  (*browsers_.begin())->LoadURL(GURL(url));
+  (*browsers_.begin())->LoadURL(GURL(url.get()));
 }
 
 void BrowserManager::Initialize(mojo::ApplicationImpl* app) {
   app_ = app;
   tracing_.Initialize(app);
 
   app_->ConnectToService("mojo:mus", &host_factory_);
 
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   // Create a Browser for each valid URL in the command line.
@@ skipping 13 matching lines @@
   connection->AddService<LaunchHandler>(this);
   return true;
 }
 
 void BrowserManager::Create(mojo::ApplicationConnection* connection,
                             mojo::InterfaceRequest<LaunchHandler> request) {
   launch_handler_bindings_.AddBinding(this, std::move(request));
 }
 
 }  // namespace mandoline