[ios] EarlGrey tests for HTTP Authentication.

ios/chrome/browser/web/forms_egtest.mm

Index: ios/chrome/browser/web/forms_egtest.mm
diff --git a/ios/chrome/browser/web/forms_egtest.mm b/ios/chrome/browser/web/forms_egtest.mm
index 00ce6b3531fc6ee59782068b2043873993949e0e..1ae8a936e8a9891f1abf28d70f9c36e03ab23b4c 100644
--- a/ios/chrome/browser/web/forms_egtest.mm
+++ b/ios/chrome/browser/web/forms_egtest.mm
@@ -259,9 +259,8 @@ const char kExpectedPostData[] = "POST Data=Unicorn";
         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"];