Revert of Set user agent type of transient item the same as pending item.

ios/web/interstitials/web_interstitial_impl.mm

 // Copyright 2015 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/interstitials/web_interstitial_impl.h"
 
 #include "base/logging.h"
 #include "ios/web/interstitials/web_interstitial_facade_delegate.h"
+#import "ios/web/navigation/crw_session_controller.h"
 #import "ios/web/navigation/navigation_manager_impl.h"
 #import "ios/web/public/interstitials/web_interstitial_delegate.h"
 #import "ios/web/public/navigation_manager.h"
 #include "ios/web/public/reload_type.h"
 #import "ios/web/web_state/web_state_impl.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
@@ skipping 33 matching lines @@
 
 WebInterstitialFacadeDelegate* WebInterstitialImpl::GetFacadeDelegate() const {
   return facade_delegate_;
 }
 
 void WebInterstitialImpl::Show() {
   PrepareForDisplay();
   GetWebStateImpl()->ShowWebInterstitial(this);
 
   if (new_navigation_) {
-    // TODO(crbug.com/706578): Plumb transient entry handling through
-    // NavigationManager, and remove the NavigationManagerImpl usage here.
-    navigation_manager_->AddTransientItem(url_);
+    // TODO(stuartmorgan): Plumb transient entry handling through
+    // NavigationManager, and remove the NavigationManagerImpl and
+    // SessionController usage here.
+    CRWSessionController* sessionController =
+        navigation_manager_->GetSessionController();
+    [sessionController addTransientItemWithURL:url_];
 
     // Give delegates a chance to set some states on the navigation item.
     GetDelegate()->OverrideItem(navigation_manager_->GetTransientItem());
   }
 }
 
 void WebInterstitialImpl::Hide() {
   GetWebStateImpl()->ClearTransientContentView();
 }
 
@@ skipping 26 matching lines @@
 
 void WebInterstitialImpl::WebStateDestroyed() {
   DontProceed();
 }
 
 WebStateImpl* WebInterstitialImpl::GetWebStateImpl() const {
   return static_cast<web::WebStateImpl*>(web_state());
 }
 
 }  // namespace web