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

ios/chrome/browser/ui/reading_list/reading_list_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/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/reading_list/ios/reading_list_model.h"
 #include "ios/chrome/browser/reading_list/reading_list_model_factory.h"
 #import "ios/chrome/browser/ui/commands/generic_chrome_command.h"
 #include "ios/chrome/browser/ui/commands/ios_command_ids.h"
 #import "ios/chrome/browser/ui/reading_list/reading_list_collection_view_item.h"
 #include "ios/chrome/grit/ios_strings.h"
 #import "ios/chrome/test/app/chrome_test_util.h"
 #import "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/testing/wait_util.h"
 #import "ios/third_party/material_components_ios/src/components/Snackbar/src/MaterialSnackbar.h"
 #import "ios/web/public/test/http_server.h"
 #import "ios/web/public/test/http_server_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 const char kReadTitle[] = "foobar";
 const char kReadURL[] = "http://readfoobar.com";
 const char kUnreadTitle[] = "I am an unread entry";
 const char kUnreadURL[] = "http://unreadfoobar.com";
 const char kReadURL2[] = "http://kReadURL2.com";
 const char kReadTitle2[] = "read item 2";
 const char kUnreadTitle2[] = "I am another unread entry";
 const char kUnreadURL2[] = "http://unreadfoobar2.com";
 const size_t kNumberReadEntries = 2;
@@ skipping 88 matching lines @@
 // Asserts |header| is visible.
 void AssertHeaderNotVisible(std::string header) {
   [[EarlGrey selectElementWithMatcher:chrome_test_util::
                                           StaticTextWithAccessibilityLabel(
                                               base::SysUTF8ToNSString(header))]
       assertWithMatcher:grey_notVisible()];
 }
 
 // Opens the reading list menu using command line.
 void OpenReadingList() {
-  base::scoped_nsobject<GenericChromeCommand> command(
-      [[GenericChromeCommand alloc] initWithTag:IDC_SHOW_READING_LIST]);
+  GenericChromeCommand* command =
+      [[GenericChromeCommand alloc] initWithTag:IDC_SHOW_READING_LIST];
   chrome_test_util::RunCommandWithActiveViewController(command);
 }
 
 // Adds a read and an unread entry to the model, opens the reading list menu and
 // enter edit mode.
 void AddEntriesAndEnterEdit() {
   ReadingListModel* model = GetReadingListModel();
   model->AddEntry(GURL(kReadURL), std::string(kReadTitle),
                   reading_list::ADDED_VIA_CURRENT_APP);
   model->SetReadStatus(GURL(kReadURL), true);
@@ skipping 288 matching lines @@
   // Tap the action sheet.
   TapButtonWithID(IDS_IOS_READING_LIST_MARK_READ_BUTTON);
 
   AssertAllEntriesVisible();
   XCTAssertEqual(kNumberReadEntries + 1, ModelReadSize(GetReadingListModel()));
   XCTAssertEqual(kNumberUnreadEntries - 1,
                  GetReadingListModel()->unread_size());
 }
 
 @end