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

ios/web/navigation/navigation_item_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_NAVIGATION_NAVIGATION_ITEM_IMPL_H_
 #define IOS_WEB_NAVIGATION_NAVIGATION_ITEM_IMPL_H_
 
 #import <Foundation/Foundation.h>
 
+#include <memory>
+
 #include "base/mac/scoped_nsobject.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "ios/web/navigation/navigation_item_facade_delegate.h"
 #include "ios/web/public/favicon_status.h"
 #include "ios/web/public/navigation_item.h"
 #include "ios/web/public/referrer.h"
 #include "ios/web/public/ssl_status.h"
 #include "url/gurl.h"
 
 namespace web {
 
 class NavigationItemFacadeDelegate;
 
 // Implementation of NavigationItem.
 class NavigationItemImpl : public web::NavigationItem {
  public:
   // Creates a default NavigationItemImpl.
   NavigationItemImpl();
   ~NavigationItemImpl() override;
 
   // Since NavigationItemImpls own their facade delegates, there is no implicit
   // copy constructor (scoped_ptrs can't be copied), so one is defined here.
   NavigationItemImpl(const NavigationItemImpl& item);
 
   // Accessors for the delegate used to drive the navigation entry facade.
   // NOTE: to minimize facade synchronization code, NavigationItems take
   // ownership of their facade delegates.
   void SetFacadeDelegate(
-      scoped_ptr<NavigationItemFacadeDelegate> facade_delegate);
+      std::unique_ptr<NavigationItemFacadeDelegate> facade_delegate);
   NavigationItemFacadeDelegate* GetFacadeDelegate() const;
 
   // NavigationItem implementation:
   int GetUniqueID() const override;
   void SetURL(const GURL& url) override;
   const GURL& GetURL() const override;
   void SetReferrer(const web::Referrer& referrer) override;
   const web::Referrer& GetReferrer() const override;
   void SetVirtualURL(const GURL& url) override;
   const GURL& GetVirtualURL() const override;
@@ skipping 81 matching lines @@
   bool is_renderer_initiated_;
 
   // Whether the navigation contains unsafe resources.
   bool is_unsafe_;
 
   // This is a cached version of the result of GetTitleForDisplay. When the URL,
   // virtual URL, or title is set, this should be cleared to force a refresh.
   mutable base::string16 cached_display_title_;
 
   // Weak pointer to the facade delegate.
-  scoped_ptr<NavigationItemFacadeDelegate> facade_delegate_;
+  std::unique_ptr<NavigationItemFacadeDelegate> facade_delegate_;
 
   // Copy and assignment is explicitly allowed for this class.
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_NAVIGATION_NAVIGATION_ITEM_IMPL_H_