Updated ownership of NavigationItems within CRWSessionController.

ios/web/navigation/crw_session_controller.h

Index: ios/web/navigation/crw_session_controller.h
diff --git a/ios/web/navigation/crw_session_controller.h b/ios/web/navigation/crw_session_controller.h
index 3859af2ac855ff9e46ca38356c75d34b536b6584..4126aec8599f57a0d1317bca94e7032c3c213d01 100644
--- a/ios/web/navigation/crw_session_controller.h
+++ b/ios/web/navigation/crw_session_controller.h
@@ -8,7 +8,7 @@
 #import <Foundation/Foundation.h>
 #include <vector>
 
-#include "ios/web/public/navigation_item_list.h"
+#import "ios/web/navigation/navigation_item_impl_list.h"
 #include "ui/base/page_transition_types.h"
 #include "url/gurl.h"
 
@@ -46,8 +46,9 @@ struct Referrer;
 @property(nonatomic, readonly, copy) NSString* openerId;
 @property(nonatomic, readonly, assign) NSInteger openerNavigationIndex;
 
-// The list of CRWSessionEntries in |_entries|'s NavigationItemImpls.
-@property(nonatomic, readonly) web::NavigationItemList items;
+// The ScopedNavigationItemImplList used to store the NavigationItemImpls for
+// this session.
+@property(nonatomic, readonly) const web::ScopedNavigationItemImplList& items;
 // The current NavigationItem.  During a pending navigation, returns the
 // NavigationItem for that navigation.  If a transient NavigationItem exists,
 // this NavigationItem will be returned.