Remove TabModel -replaceWebState: method.

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 147 matching lines @@
 // is conceptually the parent of this tab. |openedByDOM| is YES if the page was
 // opened by DOM. |model| and |browserState| must not be nil.
 - (instancetype)initWithWindowName:(NSString*)windowName
                             opener:(Tab*)opener
                        openedByDOM:(BOOL)openedByDOM
                              model:(TabModel*)parentModel
                       browserState:(ios::ChromeBrowserState*)browserState;
 
 // Create a new tab with given web state and tab model. All must be non-nil.
 - (instancetype)initWithWebState:(std::unique_ptr<web::WebState>)webState
+                           model:(TabModel*)parentModel;
+
+// Create a new tab with given web state and tab model, optionally attaching
+// the tab helpers (controlled by |attachTabHelpers|). All must be non-nil.
+- (instancetype)initWithWebState:(std::unique_ptr<web::WebState>)webState
                            model:(TabModel*)parentModel
+                attachTabHelpers:(BOOL)attachTabHelpers
     NS_DESIGNATED_INITIALIZER;
 
 - (instancetype)init NS_UNAVAILABLE;
 
 // Creates a new Tab instance loading |url| with |transition|, configured
 // with no TabModel. |opener| may be nil, and behaves exactly as for
 // -initWithWindowName:opener:model:browserState:.
 // |configuration| is a block that will be run before |url| starts loading,
 // and is the correct place to set properties and delegates on the tab.
 // Calling code must take ownership of the tab -- this is particularly important
@@ skipping 155 matching lines @@
 
 // Called when this tab is hidden.
 - (void)wasHidden;
 
 // Evaluates U2F result.
 - (void)evaluateU2FResultFromURL:(const GURL&)url;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_TABS_TAB_H_