Revert to the old back arrow style with NavigationBar

ios/chrome/browser/ui/settings/autofill_settings_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 <XCTest/XCTest.h>
 
 #include "base/mac/bind_objc_block.h"
 #import "ios/chrome/browser/ui/tools_menu/tools_menu_view_controller.h"
 #include "ios/chrome/grit/ios_strings.h"
 #import "ios/chrome/test/app/web_view_interaction_test_util.h"
@@ skipping 127 matching lines @@
       performAction:grey_tap()];
 
   // Tap on the 'George Washington' result.
   NSString* cellLabel = address;
   [[EarlGrey selectElementWithMatcher:grey_accessibilityLabel(cellLabel)]
       performAction:grey_tap()];
 }
 
 // Close the settings.
 - (void)exitSettingsMenu {
-  NSString* backButtonA11yId = @"back_bar_button";
+  NSString* backButtonA11yId = @"ic_arrow_back";
   [[EarlGrey
       selectElementWithMatcher:grey_allOf(
                                    grey_accessibilityID(backButtonA11yId),
                                    grey_accessibilityTrait(
                                        UIAccessibilityTraitButton),
                                    nil)] performAction:grey_tap()];
   [[EarlGrey
       selectElementWithMatcher:grey_allOf(
                                    grey_accessibilityID(backButtonA11yId),
                                    grey_accessibilityTrait(
@@ skipping 57 matching lines @@
                 stringWithFormat:@"%@, %@", l10n_util::GetNSString(
                                                 IDS_IOS_AUTOFILL_COUNTRY),
                                  expectation.expected_result])]
         assertWithMatcher:grey_notNil()];
   }
 
   [self exitSettingsMenu];
 }
 
 @end