Removing iPad Tab Switcher experimental flag.

ios/chrome/test/app/tab_test_util.mm

 // Copyright 2016 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/test/app/tab_test_util.h"
 
 #import <Foundation/Foundation.h>
 
 #import "base/mac/foundation_util.h"
 #import "base/mac/scoped_nsobject.h"
@@ skipping 142 matching lines @@
     [tab.webController handleLowMemory];
   }
 }
 
 void CloseAllIncognitoTabs() {
   MainController* main_controller = chrome_test_util::GetMainController();
   DCHECK(main_controller);
   TabModel* tabModel = [[main_controller browserViewInformation] otrTabModel];
   DCHECK(tabModel);
   [tabModel closeAllTabs];
-  if (!IsIPadIdiom() || !experimental_flags::IsTabSwitcherEnabled()) {
+  if (!IsIPadIdiom()) {
     // If the OTR BVC is active, wait until it isn't (since all of the
     // tabs are now closed)
     testing::WaitUntilConditionOrTimeout(testing::kWaitForUIElementTimeout, ^{
       return !IsIncognitoMode();
     });
   }
 }
 
 TabView* GetTabViewForTab(Tab* tab) {
   MainController* main_controller = GetMainController();
@@ skipping 10 matching lines @@
   return [[GetMainController() browserViewInformation] mainTabModel]
       .tabUsageRecorder->EvictedTabsMapSize();
 }
 
 FormInputAccessoryViewController* GetInputAccessoryViewController() {
   Tab* current_tab = GetCurrentTab();
   return [current_tab inputAccessoryViewController];
 }
 
 }  // namespace chrome_test_util