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

ios/web/webui/web_ui_ios_impl.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_WEBUI_WEB_UI_IOS_IMPL_H_
 #define IOS_WEB_WEBUI_WEB_UI_IOS_IMPL_H_
 
 #include <map>
+#include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "ios/public/provider/web/web_ui_ios.h"
 
 namespace web {
 class WebStateImpl;
 }
 
 namespace web {
 
@@ skipping 40 matching lines @@
   // A map of message name -> message handling callback.
   typedef std::map<std::string, MessageCallback> MessageCallbackMap;
   MessageCallbackMap message_callbacks_;
 
   // The WebUIIOSMessageHandlers we own.
   ScopedVector<WebUIIOSMessageHandler> handlers_;
 
   // Non-owning pointer to the WebStateImpl this WebUIIOS is associated with.
   WebStateImpl* web_state_;
 
-  scoped_ptr<WebUIIOSController> controller_;
+  std::unique_ptr<WebUIIOSController> controller_;
 
   DISALLOW_COPY_AND_ASSIGN(WebUIIOSImpl);
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_WEBUI_WEB_UI_IOS_IMPL_H_