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

ios/chrome/browser/tabs/tab.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_TABS_TAB_H_
 #define IOS_CHROME_BROWSER_TABS_TAB_H_
 
 #import <UIKit/UIKit.h>
 
 #include <memory>
@@ skipping 209 matching lines @@
 
 // Navigate forwards or backwards to |item|.
 - (void)goToItem:(const web::NavigationItem*)item;
 
 // Navigates forwards or backwards.
 // TODO(crbug.com/661664): These are passthroughs to CRWWebController. Convert
 // all callers and remove these methods.
 - (void)goBack;
 - (void)goForward;
 
-// Records the state (scroll position, form values, whatever can be
-// harvested) from the current page into the current session entry.
-- (void)recordStateInHistory;
-
 // Returns the timestamp of the last time the tab is visited.
 - (double)lastVisitedTimestamp;
 
 // Updates the timestamp of the last time the tab is visited.
 - (void)updateLastVisitedTimestamp;
 
 // Returns the infobars::InfoBarManager object for this tab.
 - (infobars::InfoBarManager*)infoBarManager;
 
 // Whether the content of the current tab is compatible with reader mode.
@@ skipping 61 matching lines @@
 // Evaluates U2F result.
 - (void)evaluateU2FResultFromURL:(const GURL&)url;
 
 // Cancels prerendering. It is an error to call this on anything except a
 // prerender tab (where |isPrerenderTab| is set to YES).
 - (void)discardPrerender;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_TABS_TAB_H_