convert //headless to std::unique_ptr

headless/app/headless_shell.cc

 // Copyright 2016 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 <memory>
+
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/memory/ref_counted.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/strings/string_number_conversions.h"
 #include "content/public/common/content_switches.h"
 #include "headless/app/headless_shell_switches.h"
 #include "headless/public/headless_browser.h"
@@ skipping 51 matching lines @@
 
   // HeadlessWebContents::Observer implementation:
   void DocumentOnLoadCompletedInMainFrame() override {
     ShutdownIfNeeded();
   }
 
   void DidFinishNavigation(bool success) override {}
 
  private:
   HeadlessBrowser* browser_;  // Not owned.
-  scoped_ptr<HeadlessWebContents> web_contents_;
+  std::unique_ptr<HeadlessWebContents> web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(HeadlessShell);
 };
 
 int main(int argc, const char** argv) {
   HeadlessShell shell;
   HeadlessBrowser::Options::Builder builder(argc, argv);
 
   // Enable devtools if requested.
   base::CommandLine command_line(argc, argv);
@@ skipping 21 matching lines @@
       LOG(ERROR) << "Malformed proxy server url";
       return EXIT_FAILURE;
     }
     builder.SetProxyServer(parsed_proxy_server);
   }
 
   return HeadlessBrowserMain(
       builder.Build(),
       base::Bind(&HeadlessShell::OnStart, base::Unretained(&shell)));
 }