[ios] Do not signal finish load if currentURL != lastRegisteredURL.

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 5305 matching lines @@
   GURL webViewURL = net::GURLWithNSURL([_webView URL]);
   if (_loadPhase == web::LOAD_REQUESTED &&
       ![_pendingNavigationInfo cancelled]) {
     // A fast back/forward within the same origin does not call
     // |didCommitNavigation:|, so signal page change explicitly.
     DCHECK_EQ(_documentURL.GetOrigin(), webViewURL.GetOrigin());
     [self setDocumentURL:webViewURL];
     [self webPageChanged];
   }
 
-  // Fast back forward navigation does not call |didFinishNavigation:|, so
+  [self updateSSLStatusForCurrentNavigationItem];
+
+  // Fast back forward navigation may not call |didFinishNavigation:|, so
   // signal did finish navigation explicitly.
-  [self updateSSLStatusForCurrentNavigationItem];
-  [self didFinishNavigation];
+  if (_lastRegisteredRequestURL == _documentURL) {
+    [self didFinishNavigation];
+  }
 }
 
 - (void)webViewTitleDidChange {
   // WKWebView's title becomes empty when the web process dies; ignore that
   // update.
   if (_webProcessIsDead) {
     DCHECK_EQ([_webView title].length, 0U);
     return;
   }
 
@@ skipping 315 matching lines @@
   }
 
   return web::WEB_VIEW_DOCUMENT_TYPE_GENERIC;
 }
 
 - (NSString*)refererFromNavigationAction:(WKNavigationAction*)action {
   return [action.request valueForHTTPHeaderField:@"Referer"];
 }
 
 @end