Remove unused parameter for -replaceTab:withTab:keepOldTabOpen:.

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 210 matching lines @@
 // 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 unless |keepOldTabOpen|.
-- (void)replaceTab:(Tab*)oldTab
-           withTab:(Tab*)newTab
-    keepOldTabOpen:(BOOL)keepOldTabOpen;
+// 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;
 
@@ skipping 64 matching lines @@
 // TYPED.
 - (Tab*)insertTabWithURL:(const GURL&)URL
                 referrer:(const web::Referrer&)referrer
               windowName:(NSString*)windowName
                   opener:(Tab*)parentTab
                  atIndex:(NSUInteger)index;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_TABS_TAB_MODEL_H_