[ios] WebStateList owns all WebState it manages.

ios/chrome/browser/tabs/tab_model.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_MODEL_H_
 #define IOS_CHROME_BROWSER_TABS_TAB_MODEL_H_
 
 #import <Foundation/Foundation.h>
 #import <UIKit/UIKit.h>
 
@@ skipping 177 matching lines @@
             inBackground:(BOOL)inBackground;
 
 // As above, but using WebLoadParams to specify various optional parameters.
 - (Tab*)insertTabWithLoadParams:
             (const web::NavigationManager::WebLoadParams&)params
                          opener:(Tab*)parentTab
                     openedByDOM:(BOOL)openedByDOM
                         atIndex:(NSUInteger)index
                    inBackground:(BOOL)inBackground;
 
-// Inserts a new tab at the given |index| with the session history specified by
-// |webState|. Does not go through the order controller as this is generally
-// used only for restoring a previous session and the index is fixed.
-- (Tab*)insertTabWithWebState:(std::unique_ptr<web::WebState>)webState
-                      atIndex:(NSUInteger)index;
-
-// Inserts |tab| at the given |index|. Broadcasts the proper notifications about
-// the change. The receiver should be set as the parentTabModel for |tab|; this
-// method doesn't check that.
-- (void)insertTab:(Tab*)tab atIndex:(NSUInteger)index;
-
 // Moves |tab| to the given |index|. |index| must be valid for this tab model
 // (must be less than the current number of tabs). |tab| must already be in this
 // tab model. If |tab| is already at |index|, this method does nothing and will
 // not notify observers.
 - (void)moveTab:(Tab*)tab toIndex:(NSUInteger)index;
 
-// Replaces |oldTab| in the model with |newTab|. Closes the oldTab when
-// replacing it in the model.
-- (void)replaceTab:(Tab*)oldTab withTab:(Tab*)newTab;
-
 // Closes the tab at the given |index|. |index| must be valid.
 - (void)closeTabAtIndex:(NSUInteger)index;
 
 // Closes the given tab.
 - (void)closeTab:(Tab*)tab;
 
 // Closes ALL the tabs.
 - (void)closeAllTabs;
 
 // Halts all tabs (terminating active requests) without closing them. Used
@@ skipping 33 matching lines @@
 - (void)setPrimary:(BOOL)primary;
 
 // Returns a set with the names of the files received from other applications
 // that are still referenced by an open or recently closed tab.
 - (NSSet*)currentlyReferencedExternalFiles;
 
 // Called when the browser state provided to this instance is being destroyed.
 // At this point the tab model will no longer ever be active, and will likely be
 // deallocated soon.
 - (void)browserStateDestroyed;
-// Called by the Tab to inform its parent that it has been closed.
-- (void)didCloseTab:(Tab*)closedTab;
 // Called by |tab| to inform the model that a navigation has taken place.
 // TODO(crbug.com/661983): once more of the navigation state has moved into WC,
 // replace this with WebStateObserver.
 - (void)navigationCommittedInTab:(Tab*)tab
                     previousItem:(web::NavigationItem*)previousItem;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_TABS_TAB_MODEL_H_