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

ios/chrome/browser/tabs/tab_model.mm

Index: ios/chrome/browser/tabs/tab_model.mm
diff --git a/ios/chrome/browser/tabs/tab_model.mm b/ios/chrome/browser/tabs/tab_model.mm
index 1bf1d713eb32753a8c48cd9bcea0b946f1ba71f4..7f4dfa849e88879c1a94e1d1e62ef8f05f90ec3a 100644
--- a/ios/chrome/browser/tabs/tab_model.mm
+++ b/ios/chrome/browser/tabs/tab_model.mm
@@ -686,10 +686,6 @@ void CleanCertificatePolicyCache(
 #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
@@ -720,9 +716,6 @@ void CleanCertificatePolicyCache(
   int oldCount = _webStateList->count();
   DCHECK_GE(oldCount, 0);
 
-  if (persistState && self.currentTab)
-    [self.currentTab recordStateInHistory];
-
   web::WebState::CreateParams createParams(_browserState);
   DeserializeWebStateList(
       _webStateList.get(), window,