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

ios/chrome/browser/tabs/tab_model.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/chrome/browser/tabs/tab_model.h"
 
 #include <cstdint>
 #include <utility>
 #include <vector>
 
@@ skipping 668 matching lines @@
   for (Tab* tab in self) {
     if ([tab.webController isViewAlive])
       count++;
   }
   return count;
 }
 
 #pragma mark - Private methods
 
 - (SessionWindowIOS*)windowForSavingSession {
-  // Background tabs will already have their state preserved, but not the
-  // fg tab. Do it now.
-  [self.currentTab recordStateInHistory];
-
   // Build the array of sessions. Copy the session objects as the saving will
   // be done on a separate thread.
   // TODO(crbug.com/661986): This could get expensive especially since this
   // window may never be saved (if another call comes in before the delay).
   return SerializeWebStateList(_webStateList.get());
 }
 
 - (void)postNotificationName:(NSString*)notificationName withTab:(Tab*)tab {
   // A scoped_nsobject is used rather than an NSDictionary with static
   // initializer dictionaryWithObject, because that approach adds the dictionary
@@ skipping 10 matching lines @@
                 persistState:(BOOL)persistState {
   DCHECK(_browserState);
   DCHECK(window);
 
   if (!window.sessions.count)
     return NO;
 
   int oldCount = _webStateList->count();
   DCHECK_GE(oldCount, 0);
 
-  if (persistState && self.currentTab)
-    [self.currentTab recordStateInHistory];
-
   web::WebState::CreateParams createParams(_browserState);
   DeserializeWebStateList(
       _webStateList.get(), window,
       base::BindRepeating(&web::WebState::CreateWithStorageSession,
                           createParams));
 
   DCHECK_GT(_webStateList->count(), oldCount);
   int restoredCount = _webStateList->count() - oldCount;
   DCHECK_EQ(window.sessions.count, static_cast<NSUInteger>(restoredCount));
 
@@ skipping 69 matching lines @@
 }
 
 // Called when UIApplicationWillEnterForegroundNotification is received.
 - (void)applicationWillEnterForeground:(NSNotification*)notify {
   if (_tabUsageRecorder) {
     _tabUsageRecorder->AppWillEnterForeground();
   }
 }
 
 @end