Revert "Updated ownership of NavigationItems within CRWSessionController."

ios/web/navigation/crw_session_entry.h

Index: ios/web/navigation/crw_session_entry.h
diff --git a/ios/web/navigation/crw_session_entry.h b/ios/web/navigation/crw_session_entry.h
index f584712fde61cb467f768d6d01315e6fff1c72a0..1251d34f6596908d886a79dac06838fb39ea06cd 100644
--- a/ios/web/navigation/crw_session_entry.h
+++ b/ios/web/navigation/crw_session_entry.h
@@ -8,6 +8,8 @@
 #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"
@@ -25,7 +27,7 @@ class NavigationItemImpl;
 // 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.
@@ -35,7 +37,8 @@ class NavigationItemImpl;
 @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