[ios] Do not reset SSL status if load was cancelled.

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 3395 matching lines @@
         _lastUserInteraction->time > _lastTransferTimeInSeconds &&
         timeSinceInteraction >= 0.0;
   } else {
     // If the error does not have timing information, check if the user
     // interacted with the page recently.
     userInteracted = [self userIsInteracting];
   }
   if (!inMainFrame && !userInteracted)
     return;
 
-  // Reset SSL status to default.
+  // Reset SSL status to default, unless the load was cancelled (manually or by
+  // back-forward navigation).
   web::NavigationManager* navManager = self.webState->GetNavigationManager();
-  if (navManager->GetLastCommittedItem())
+  if (navManager->GetLastCommittedItem() && [error code] != NSURLErrorCancelled)
     navManager->GetLastCommittedItem()->GetSSL() = web::SSLStatus();
 
   NSURL* errorURL = [NSURL
       URLWithString:[userInfo objectForKey:NSURLErrorFailingURLStringErrorKey]];
   const GURL errorGURL = net::GURLWithNSURL(errorURL);
 
   // Handles Frame Load Interrupted errors from WebView.
   if ([error.domain isEqual:base::SysUTF8ToNSString(web::kWebKitErrorDomain)] &&
       error.code == web::kWebKitErrorFrameLoadInterruptedByPolicyChange) {
     // See if the delegate wants to handle this case.
@@ skipping 2200 matching lines @@
   }
 
   return web::WEB_VIEW_DOCUMENT_TYPE_GENERIC;
 }
 
 - (NSString*)refererFromNavigationAction:(WKNavigationAction*)action {
   return [action.request valueForHTTPHeaderField:@"Referer"];
 }
 
 @end