Create shared matcher for navigation bar done button.

ios/chrome/browser/ui/dialogs/javascript_dialog_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>
 
 #import "base/strings/sys_string_conversions.h"
 #include "components/strings/grit/components_strings.h"
@@ skipping 12 matching lines @@
 #import "ios/web/public/test/http_server_util.h"
 #include "ios/web/public/web_state/web_state.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 #import "url/gurl.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
+using chrome_test_util::NavigationBarDoneButton;
+
 namespace {
 
 // Enum specifying different types of JavaScript alerts:
 //   - JavaScriptAlertType::ALERT - Dialog with only one OK button.
 //   - JavaScriptAlertType::CONFIRMATION - Dialog with OK and Cancel button.
 //   - JavaScriptAlertType::PROMPT - Dialog with OK button, cancel button, and
 //     a text field.
 enum class JavaScriptAlertType : NSUInteger { ALERT, CONFIRMATION, PROMPT };
 
 // Script to inject that will show an alert.  The document's body will be reset
@@ skipping 408 matching lines @@
                                               IDS_IOS_SETTINGS_TITLE)]
       assertWithMatcher:grey_sufficientlyVisible()];
 
   // Show an alert.
   DisplayJavaScriptAlert(JavaScriptAlertType::ALERT);
 
   // Make sure the alert is not present.
   AssertJavaScriptAlertNotPresent();
 
   // Close the settings.
-  [[EarlGrey
-      selectElementWithMatcher:chrome_test_util::ButtonWithAccessibilityLabelId(
-                                   IDS_IOS_NAVIGATION_BAR_DONE_BUTTON)]
+  [[EarlGrey selectElementWithMatcher:NavigationBarDoneButton()]
       performAction:grey_tap()];
 
   // Make sure the alert is present.
   WaitForJavaScripDialogToBeShown();
 
   // Tap the OK button.
   TapOK();
 
   // Wait for the html body to be reset to the correct value.
   WaitForWebDisplay(kAlertResultBody);
@@ skipping 20 matching lines @@
   ShowJavaScriptDialog(JavaScriptAlertType::ALERT);
 
   // Tap the OK button.
   TapOK();
 
   // Wait for the html body to be reset to the correct value.
   WaitForWebDisplay(kAlertResultBody);
 }
 
 @end