[ios] EarlGrey tests for HTTP Authentication.

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 221 matching lines @@
       performAction:grey_typeText(input)];
 }
 
 void TapOK() {
   id<GREYMatcher> ok_button =
       chrome_test_util::buttonWithAccessibilityLabelId(IDS_OK);
   [[EarlGrey selectElementWithMatcher:ok_button] performAction:grey_tap()];
 }
 
 void TapCancel() {
-  id<GREYMatcher> cancel_button =
-      chrome_test_util::buttonWithAccessibilityLabelId(IDS_CANCEL);
-  [[EarlGrey selectElementWithMatcher:cancel_button] performAction:grey_tap()];
+  [[EarlGrey selectElementWithMatcher:chrome_test_util::cancelButton()]
+      performAction:grey_tap()];
 }
 
 void TapSuppressDialogsButton() {
   id<GREYMatcher> suppress_dialogs_button =
       chrome_test_util::buttonWithAccessibilityLabelId(
           IDS_IOS_JAVA_SCRIPT_DIALOG_BLOCKING_BUTTON_TEXT);
   [[EarlGrey selectElementWithMatcher:suppress_dialogs_button]
       performAction:grey_tap()];
 }
 
@@ skipping 20 matching lines @@
       chrome_test_util::webViewContainingText(std::string(""));
   [[EarlGrey selectElementWithMatcher:response2Matcher]
       assertWithMatcher:grey_notNil()];
 }
 
 - (void)tearDown {
   NSError* errorOK = nil;
   NSError* errorCancel = nil;
 
   // Dismiss JavaScript alert by tapping Cancel.
-  id<GREYMatcher> CancelButton =
-      chrome_test_util::buttonWithAccessibilityLabelId(IDS_CANCEL);
-  [[EarlGrey selectElementWithMatcher:CancelButton] performAction:grey_tap()
-                                                            error:&errorCancel];
+  [[EarlGrey selectElementWithMatcher:chrome_test_util::cancelButton()]
+      performAction:grey_tap()
+              error:&errorCancel];
   // Dismiss JavaScript alert by tapping OK.
   id<GREYMatcher> OKButton =
       chrome_test_util::buttonWithAccessibilityLabelId(IDS_OK);
   [[EarlGrey selectElementWithMatcher:OKButton] performAction:grey_tap()
                                                         error:&errorOK];
 
   if (!errorOK || !errorCancel) {
     GREYFail(@"There are still alerts");
   }
   [super tearDown];
@@ skipping 197 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