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

ios/chrome/browser/ui/tab_switcher/tab_switcher_controller.mm

 // Copyright 2015 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/ui/tab_switcher/tab_switcher_controller.h"
 
 #include "base/ios/block_types.h"
 #include "base/ios/weak_nsobject.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/metrics/user_metrics.h"
@@ skipping 322 matching lines @@
   [self selectPanelForTabModel:activeModel];
 }
 
 - (void)setOtrTabModel:(TabModel*)otrModel {
   [_cache setMainTabModel:[_cache mainTabModel] otrTabModel:otrModel];
   [_tabSwitcherModel setMainTabModel:[_tabSwitcherModel mainTabModel]
                          otrTabModel:otrModel];
 }
 
 - (void)showWithSelectedTabAnimation {
-  // Stores the current tab's scroll position. Helps determine whether the
-  // current tab snapshot should be updated or not.
-  [_onLoadActiveModel.currentTab recordStateInHistory];
-
   [self updateWindowBackgroundColor];
   [self performTabSwitcherTransition:TransitionType::TRANSITION_PRESENT
                            withModel:_onLoadActiveModel
                             animated:YES
                       withCompletion:^{
                         [self.delegate
                             tabSwitcherPresentationTransitionDidEnd:self];
                       }];
 }
 
@@ skipping 868 matching lines @@
         base::UserMetricsAction("MobileTabSwitcherCloseNonIncognitoTab"));
   }
 }
 
 - (void)tabSwitcherPanelControllerDidUpdateOverlayViewVisibility:
     (TabSwitcherPanelController*)tabSwitcherPanelController {
   [_tabSwitcherView updateOverlayButtonState];
 }
 
 @end