Removing iPad Tab Switcher experimental flag.

ios/chrome/browser/ui/tab_switcher/tab_switcher_controller_egtest.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 <EarlGrey/EarlGrey.h>
 #import <UIKit/UIKit.h>
 #import <XCTest/XCTest.h>
 
 #include "base/mac/scoped_nsobject.h"
-#include "base/test/scoped_command_line.h"
 #import "ios/chrome/app/main_controller_private.h"
 #include "ios/chrome/browser/chrome_switches.h"
 #import "ios/chrome/browser/ui/commands/generic_chrome_command.h"
 #include "ios/chrome/browser/ui/commands/ios_command_ids.h"
 #import "ios/chrome/browser/ui/tools_menu/tools_menu_view_controller.h"
 #import "ios/chrome/browser/ui/ui_util.h"
 #include "ios/chrome/grit/ios_strings.h"
 #import "ios/chrome/test/app/chrome_test_util.h"
 #import "ios/chrome/test/earl_grey/chrome_earl_grey_ui.h"
 #import "ios/chrome/test/earl_grey/chrome_matchers.h"
@@ skipping 55 matching lines @@
   base::scoped_nsobject<GenericChromeCommand> command(
       [[GenericChromeCommand alloc] initWithTag:IDC_TOGGLE_TAB_SWITCHER]);
   chrome_test_util::RunCommandWithActiveViewController(command);
 }
 
 }  // namespace
 
 @interface TabSwitcherControllerTestCase : ChromeTestCase
 @end
 
-@implementation TabSwitcherControllerTestCase {
-  std::unique_ptr<base::test::ScopedCommandLine> scoped_command_line_;
-}
-
-- (void)setUp {
-  [super setUp];
-  scoped_command_line_.reset(new base::test::ScopedCommandLine());
-  scoped_command_line_->GetProcessCommandLine()->AppendSwitch(
-      switches::kEnableTabSwitcher);
-}
+@implementation TabSwitcherControllerTestCase
 
 // Checks that the tab switcher is not presented.
 - (void)assertTabSwitcherIsInactive {
   [[GREYUIThreadExecutor sharedInstance] drainUntilIdle];
   MainController* main_controller = chrome_test_util::GetMainController();
   GREYAssertTrue(![main_controller isTabSwitcherActive],
                  @"Tab Switcher should be inactive");
 }
 
 // Checks that the tab switcher is active.
@@ skipping 106 matching lines @@
 
   // Press the :: icon to exit the tab switcher.
   [[EarlGrey selectElementWithMatcher:TabSwitcherCloseButton()]
       performAction:grey_tap()];
 
   // Verify that we've left the tab switcher.
   [self assertTabSwitcherIsInactive];
 }
 
 @end