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

ios/chrome/browser/ui/settings/block_popups_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>
 
 #include "base/ios/ios_util.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 13 matching lines @@
 #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"
 #import "ios/web/public/test/web_view_interaction_test_util.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 using chrome_test_util::NavigationBarDoneButton;
 
 namespace {
 
 // URLs used in the tests.
 const char* kBlockPopupsUrl = "http://blockpopups";
 const char* kOpenedWindowUrl = "http://openedwindow";
 
 // Page with a button that opens a new window after a short delay.
 NSString* kBlockPopupsResponseTemplate =
@@ skipping 153 matching lines @@
   responses[blockPopupsURL] = base::SysNSStringToUTF8([NSString
       stringWithFormat:kBlockPopupsResponseTemplate, openedWindowURLString]);
   responses[openedWindowURL] = kOpenedWindowResponse;
   web::test::SetUpSimpleHttpServer(responses);
 
   ScopedBlockPopupsPref prefSetter(CONTENT_SETTING_ALLOW);
   [ChromeEarlGrey loadURL:blockPopupsURL];
   chrome_test_util::AssertMainTabCount(1U);
 
   // Request popup and make sure the popup opened in a new tab.
-  NSError* error = nil;
+  __unsafe_unretained NSError* error = nil;
   chrome_test_util::ExecuteJavaScript(kOpenPopupScript, &error);
   GREYAssert(!error, @"Error during script execution: %@", error);
   chrome_test_util::AssertMainTabCount(2U);
 
   // No infobar should be displayed.
   [[EarlGrey selectElementWithMatcher:chrome_test_util::
                                           StaticTextWithAccessibilityLabel(
                                               @"Pop-ups blocked (1)")]
       assertWithMatcher:grey_notVisible()];
 }
@@ skipping 11 matching lines @@
   responses[openedWindowURL] = kOpenedWindowResponse;
   web::test::SetUpSimpleHttpServer(responses);
 
   ScopedBlockPopupsPref prefSetter(CONTENT_SETTING_BLOCK);
   [ChromeEarlGrey loadURL:blockPopupsURL];
   chrome_test_util::AssertMainTabCount(1U);
 
   // Request popup, then make sure it was blocked and an infobar was displayed.
   // The window.open() call is run via async JS, so the infobar may not open
   // immediately.
-  NSError* error = nil;
+  __unsafe_unretained NSError* error = nil;
   chrome_test_util::ExecuteJavaScript(kOpenPopupScript, &error);
   GREYAssert(!error, @"Error during script execution: %@", error);
 
   [[GREYCondition
       conditionWithName:@"Wait for blocked popups infobar to show"
                   block:^BOOL {
                     NSError* error = nil;
                     [[EarlGrey
                         selectElementWithMatcher:
                             chrome_test_util::StaticTextWithAccessibilityLabel(
@@ skipping 46 matching lines @@
       assertWithMatcher:grey_sufficientlyVisible()];
   [[EarlGrey
       selectElementWithMatcher:grey_accessibilityLabel(l10n_util::GetNSString(
                                    IDS_IOS_NAVIGATION_BAR_EDIT_BUTTON))]
       assertWithMatcher:grey_sufficientlyVisible()];
 
   CloseSettings();
 }
 
 @end