[ios] EarlGrey tests for HTTP Authentication.

ios/chrome/browser/web/forms_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/scoped_nsobject.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/strings/grit/components_strings.h"
@@ skipping 241 matching lines @@
         initWithMatchesBlock:^BOOL(UIView* view) {
           return [NSStringFromClass([view class]) hasPrefix:@"UIDimmingView"];
         }
         descriptionBlock:^(id<GREYDescription> description) {
           [description appendText:@"class prefixed with UIDimmingView"];
         }]);
     [[EarlGrey selectElementWithMatcher:matcher]
         performAction:grey_tapAtPoint(CGPointMake(50.0f, 50.0f))];
   } else {
     // On handset, dismiss via the cancel button.
-    id<GREYMatcher> cancel =
-        chrome_test_util::buttonWithAccessibilityLabelId(IDS_CANCEL);
-    [[EarlGrey selectElementWithMatcher:cancel] performAction:grey_tap()];
+    [[EarlGrey selectElementWithMatcher:chrome_test_util::cancelButton()]
+        performAction:grey_tap()];
   }
   // Check that the POST is changed to a GET
   [self waitForExpectedResponse:"GET"];
 }
 
 // Tests that a POST followed by a redirect does not show the popup.
 - (void)testFormsDontResendPostDataAfterRedirect {
   [ChromeEarlGrey loadURL:web::test::HttpServer::MakeUrl(kRedirectFormUrl)];
   // Submit the form, which redirects before printing the data.
   [self submitForm];
   // Check that the redirect changes the POST to a GET.
   [self waitForExpectedResponse:"GET"];
   [self reloadPage];
 
   // Check that the popup did not show
   id<GREYMatcher> resendWarning =
       chrome_test_util::buttonWithAccessibilityLabelId(
           IDS_HTTP_POST_WARNING_RESEND);
   [[EarlGrey selectElementWithMatcher:resendWarning]
       assertWithMatcher:grey_nil()];
 
   [self waitForExpectedResponse:"GET"];
 }
 
 @end