Remove Tab -currentNavigationItem.

ios/web/web_state/ui/crw_web_controller.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/web_state/ui/crw_web_controller.h"
 
 #import <WebKit/WebKit.h>
 
 #import <objc/runtime.h>
 #include <stddef.h>
@@ skipping 4777 matching lines @@
     querySSLStatusForTrust:(base::ScopedCFTypeRef<SecTrustRef>)trust
                       host:(NSString*)host
          completionHandler:(StatusQueryHandler)completionHandler {
   [_certVerificationController querySSLStatusForTrust:std::move(trust)
                                                  host:host
                                     completionHandler:completionHandler];
 }
 
 - (void)SSLStatusUpdater:(CRWSSLStatusUpdater*)SSLStatusUpdater
     didChangeSSLStatusForNavigationItem:(web::NavigationItem*)navigationItem {
-  web::NavigationItem* currentNavigationItem =
+  web::NavigationItem* lastCommittedNavigationItem =
       self.webState->GetNavigationManager()->GetLastCommittedItem();
-  if (navigationItem == currentNavigationItem) {
+  if (navigationItem == lastCommittedNavigationItem) {
     [self didUpdateSSLStatusForCurrentNavigationItem];
   }
 }
 
 #pragma mark -
 #pragma mark CRWWebContextMenuControllerDelegate methods
 
 - (BOOL)webView:(WKWebView*)webView
     handleContextMenu:(const web::ContextMenuParams&)params {
   DCHECK(webView == _webView);
@@ skipping 408 matching lines @@
 - (void)simulateLoadRequestWithURL:(const GURL&)URL {
   _lastRegisteredRequestURL = URL;
   _loadPhase = web::LOAD_REQUESTED;
 }
 
 - (NSString*)referrerFromNavigationAction:(WKNavigationAction*)action {
   return [action.request valueForHTTPHeaderField:kReferrerHeaderName];
 }
 
 @end