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

ios/chrome/browser/tabs/tab_model.mm

 // 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.
 
 #import "ios/chrome/browser/tabs/tab_model.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 542 matching lines @@
     return;
   }
 
   base::scoped_nsobject<Tab> tabSaver([tab retain]);
   [_tabs removeObject:tab];
   [_tabs insertObject:tab atIndex:toIndex];
 
   [_observers tabModel:self didMoveTab:tab fromIndex:fromIndex toIndex:toIndex];
 }
 
-- (void)replaceTab:(Tab*)oldTab
-           withTab:(Tab*)newTab
-    keepOldTabOpen:(BOOL)keepOldTabOpen {
+- (void)replaceTab:(Tab*)oldTab withTab:(Tab*)newTab {
   NSUInteger index = [self indexOfTab:oldTab];
   DCHECK_NE(NSNotFound, static_cast<NSInteger>(index));
 
   base::scoped_nsobject<Tab> tabSaver([oldTab retain]);
   [newTab fetchFavicon];
   [_tabs replaceObjectAtIndex:index withObject:newTab];
   [newTab setParentTabModel:self];
 
   TabParentingGlobalObserver::GetInstance()->OnTabParented(newTab.webState);
   [_observers tabModel:self didReplaceTab:oldTab withTab:newTab atIndex:index];
 
   if (self.currentTab == oldTab)
     [self changeSelectedTabFrom:nil to:newTab persistState:NO];
 
   [oldTab setParentTabModel:nil];
-  if (!keepOldTabOpen)
-    [oldTab close];
+  [oldTab close];
 
   // Record a tab clobber, since swapping tabs bypasses the tab code that would
   // normally log clobbers.
   base::RecordAction(base::UserMetricsAction("MobileTabClobbered"));
 }
 
 - (void)closeTabAtIndex:(NSUInteger)index {
   DCHECK(index < [_tabs count]);
   [self closeTab:[_tabs objectAtIndex:index]];
 }
@@ skipping 488 matching lines @@
   web::NavigationManager::WebLoadParams params(URL);
   params.referrer = referrer;
   params.transition_type = ui::PAGE_TRANSITION_TYPED;
   [[tab webController] loadWithParams:params];
   [tab webController].webUsageEnabled = webUsageEnabled_;
   [self insertTab:tab atIndex:index];
   return tab;
 }
 
 @end