Revert "Updated ownership of NavigationItems within CRWSessionController."

ios/web/navigation/crw_session_entry.h

 // Copyright 2012 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_CRW_SESSION_ENTRY_H_
 #define IOS_WEB_NAVIGATION_CRW_SESSION_ENTRY_H_
 
 #import <Foundation/Foundation.h>
 #include <stdint.h>
 
+#include <memory>
+
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "ui/base/page_transition_types.h"
 #include "url/gurl.h"
 
 namespace web {
 class NavigationItem;
 class NavigationItemImpl;
 }
 
 // A CRWSessionEntry is similar to a NavigationEntry object in desktop Chrome.
 // It maintains the information needed to save/restore a single entry in session
 // history (i.e., one site) for a tab. A tab may have multiple of these objects
 // comprising its entire session history.
 // DEPRECATED, do not use this class and do not add any methods to it.
 // Use web::NavigationItem instead.
 // TODO(crbug.com/454984): Remove this class.
-@interface CRWSessionEntry : NSObject
+@interface CRWSessionEntry : NSObject<NSCopying>
 
 // Pointer to the NavigationItem associated with this CRWSessionEntry.
 // Eventually, this will replace CRWSessionEntry entirely.
 @property(nonatomic, readonly) web::NavigationItem* navigationItem;
 
 // Pointer to the NavigationItemImpl associated with this CRWSessionEntry.
 @property(nonatomic, readonly) web::NavigationItemImpl* navigationItemImpl;
 
 // Initialize the session entry with the given NavigationItem.
-- (instancetype)initWithNavigationItem:(web::NavigationItem*)item;
+- (instancetype)initWithNavigationItem:
+    (std::unique_ptr<web::NavigationItem>)item;
 
 @end
 
 #endif  // IOS_WEB_NAVIGATION_CRW_SESSION_ENTRY_H_