Create shared matcher for navigation bar done button.

ios/chrome/browser/ui/dialogs/javascript_dialog_egtest.mm

Index: ios/chrome/browser/ui/dialogs/javascript_dialog_egtest.mm
diff --git a/ios/chrome/browser/ui/dialogs/javascript_dialog_egtest.mm b/ios/chrome/browser/ui/dialogs/javascript_dialog_egtest.mm
index 17a8f0d00f5b10c197ae5e287127ab0335c68c4b..daed6bae138f37626f0aa27fbc190b586bc3b710 100644
--- a/ios/chrome/browser/ui/dialogs/javascript_dialog_egtest.mm
+++ b/ios/chrome/browser/ui/dialogs/javascript_dialog_egtest.mm
@@ -30,6 +30,8 @@
 #error "This file requires ARC support."
 #endif
 
+using chrome_test_util::NavigationBarDoneButton;
+
 namespace {
 
 // Enum specifying different types of JavaScript alerts:
@@ -458,9 +460,7 @@ void TapSuppressDialogsButton() {
   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.