[ObjC ARC] Converts ios/chrome/browser/ui/settings:eg_tests to ARC.

ios/chrome/browser/ui/settings/autofill_settings_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>
 
 #import "base/mac/bind_objc_block.h"
 #include "ios/chrome/browser/ui/tools_menu/tools_menu_constants.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ios/chrome/test/app/web_view_interaction_test_util.h"
 #include "ios/chrome/test/earl_grey/accessibility_util.h"
 #import "ios/chrome/test/earl_grey/chrome_earl_grey.h"
 #import "ios/chrome/test/earl_grey/chrome_earl_grey_ui.h"
 #import "ios/chrome/test/earl_grey/chrome_matchers.h"
 #import "ios/chrome/test/earl_grey/chrome_test_case.h"
 #import "ios/web/public/test/http_server.h"
 #include "ios/web/public/test/http_server_util.h"
 #include "ui/base/l10n/l10n_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 using chrome_test_util::ButtonWithAccessibilityLabel;
 using chrome_test_util::ButtonWithAccessibilityLabelId;
 using chrome_test_util::NavigationBarDoneButton;
 
 namespace {
 
 // Expectation of how the saved autofill profile looks like, a map from cell
 // name IDs to expected contents.
 struct DisplayStringIDToExpectedResult {
   int display_string_id;
@@ skipping 207 matching lines @@
   // Switch on edit mode.
   [[EarlGrey selectElementWithMatcher:ButtonWithAccessibilityLabelId(
                                           IDS_IOS_NAVIGATION_BAR_EDIT_BUTTON)]
       performAction:grey_tap()];
   chrome_test_util::VerifyAccessibilityForCurrentScreen();
 
   [self exitSettingsMenu];
 }
 
 @end