Add CRWSessionEntry isEqual

ios/web/navigation/crw_session_entry.mm

 // 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.
 
 #import "ios/web/navigation/crw_session_entry.h"
 
 #include <stdint.h>
 
 #include <memory>
 
@@ skipping 41 matching lines @@
 }
 
 - (web::NavigationItem*)navigationItem {
   return _item;
 }
 
 - (web::NavigationItemImpl*)navigationItemImpl {
   return _item;
 }
 
+- (BOOL)isEqual:(CRWSessionEntry*)object {
+  return _item == [object navigationItem];
+}
+
 @end