Convert //ios from scoped_ptr to std::unique_ptr.

ios/web/public/app/web_main.h

 // 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.
 
 #ifndef IOS_WEB_PUBLIC_APP_WEB_MAIN_H_
 #define IOS_WEB_PUBLIC_APP_WEB_MAIN_H_
 
-#include "base/memory/scoped_ptr.h"
+#include <memory>
+
 #include "ios/web/public/app/web_main_delegate.h"
 
 namespace web {
 class WebMainRunner;
 
 // Contains parameters passed to WebMain.
 struct WebMainParams {
   explicit WebMainParams(WebMainDelegate* delegate)
       : delegate(delegate),
         register_exit_manager(true),
@@ skipping 14 matching lines @@
 // is not destroyed while web/ code is still on the stack.
 //
 // Clients can add custom code to the startup flow by implementing the methods
 // in WebMainDelegate and WebMainParts.
 class WebMain {
  public:
   explicit WebMain(const WebMainParams& params);
   ~WebMain();
 
  private:
-  scoped_ptr<WebMainRunner> web_main_runner_;
+  std::unique_ptr<WebMainRunner> web_main_runner_;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_APP_WEB_MAIN_H_