Refine the accessibility label of Clear Browsing Data flow.

ios/chrome/browser/ui/settings/clear_browsing_data_collection_view_controller.mm

 // Copyright 2015 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/ui/settings/clear_browsing_data_collection_view_controller.h"
 
 #include <memory>
 #include <string>
 
 #include "base/ios/ios_util.h"
@@ skipping 622 matching lines @@
       alertControllerWithTitle:nil
                        message:nil
                 preferredStyle:UIAlertControllerStyleActionSheet];
 
   UIAlertAction* clearDataAction = [UIAlertAction
       actionWithTitle:l10n_util::GetNSString(IDS_IOS_CLEAR_BUTTON)
                 style:UIAlertActionStyleDestructive
               handler:^(UIAlertAction* action) {
                 [weakSelf clearDataForDataTypes:dataTypeMaskToRemove];
               }];
+  clearDataAction.accessibilityLabel =
+      l10n_util::GetNSString(IDS_IOS_CONFIRM_CLEAR_BUTTON);
   UIAlertAction* cancelAction =
       [UIAlertAction actionWithTitle:l10n_util::GetNSString(IDS_CANCEL)
                                style:UIAlertActionStyleCancel
                              handler:nil];
   [alertController addAction:clearDataAction];
   [alertController addAction:cancelAction];
   [self presentViewController:alertController animated:YES completion:nil];
   return YES;
 }
 
@@ skipping 240 matching lines @@
 
 #pragma mark TimeRangeSelectorCollectionViewControllerDelegate
 
 - (void)timeRangeSelectorViewController:
             (TimeRangeSelectorCollectionViewController*)collectionViewController
                     didSelectTimePeriod:(browsing_data::TimePeriod)timePeriod {
   _timePeriod = timePeriod;
 }
 
 @end