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

ios/chrome/browser/tabs/tab.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.h"
 
 #import <CoreLocation/CoreLocation.h>
 #import <UIKit/UIKit.h>
 
 #include <utility>
@@ skipping 1190 matching lines @@
   }
 
   if (!navigation->IsErrorPage()) {
     [self addCurrentEntryToHistoryDB];
     [self countMainFrameLoad];
   }
 
   [parentTabModel_ notifyTabChanged:self];
 }
 
-// Records the state (scroll position, form values, whatever can be
-// harvested) from the current page into the current session entry.
-- (void)recordStateInHistory {
-  // Link-loading prerender tab may not have correct zoom value during the load.
-  if (!self.isLinkLoadingPrerenderTab)
-    [self.webController recordStateInHistory];
-}
-
 // Records metric for the interface's orientation.
 - (void)recordInterfaceOrientation {
   switch ([[UIApplication sharedApplication] statusBarOrientation]) {
     case UIInterfaceOrientationPortrait:
     case UIInterfaceOrientationPortraitUpsideDown:
       UMA_HISTOGRAM_BOOLEAN("Tab.PageLoadInPortrait", YES);
       break;
     case UIInterfaceOrientationLandscapeLeft:
     case UIInterfaceOrientationLandscapeRight:
       UMA_HISTOGRAM_BOOLEAN("Tab.PageLoadInPortrait", NO);
@@ skipping 731 matching lines @@
 
 - (TabModel*)parentTabModel {
   return parentTabModel_;
 }
 
 - (FormInputAccessoryViewController*)inputAccessoryViewController {
   return inputAccessoryViewController_.get();
 }
 
 @end