[ios] Reduce access to private //ios/web API.

ios/web/web_state/web_state_impl.mm

 // Copyright 2013 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/web_state_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
@@ skipping 632 matching lines @@
 WebStateImpl::GetSessionCertificatePolicyCache() const {
   return &GetSessionCertificatePolicyCacheImpl();
 }
 
 SessionCertificatePolicyCache*
 WebStateImpl::GetSessionCertificatePolicyCache() {
   return &GetSessionCertificatePolicyCacheImpl();
 }
 
 CRWSessionStorage* WebStateImpl::BuildSessionStorage() {
+  [web_controller_ recordStateInHistory];
   SessionStorageBuilder session_storage_builder;
   return session_storage_builder.BuildStorage(this);
 }
 
 CRWJSInjectionReceiver* WebStateImpl::GetJSInjectionReceiver() const {
   return [web_controller_ jsInjectionReceiver];
 }
 
 void WebStateImpl::ExecuteJavaScript(const base::string16& javascript) {
   [web_controller_ executeJavaScript:base::SysUTF16ToNSString(javascript)
@@ skipping 105 matching lines @@
     const LoadCommittedDetails& load_details) {
   for (auto& observer : observers_)
     observer.NavigationItemCommitted(load_details);
 }
 
 WebState* WebStateImpl::GetWebState() {
   return this;
 }
 
 }  // namespace web