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

ios/chrome/browser/ui/settings/save_passwords_collection_view_controller_unittest.mm

 // Copyright 2015 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 "ios/chrome/browser/ui/settings/save_passwords_collection_view_controller.h"
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/strings/utf_string_conversions.h"
 #import "base/test/ios/wait_util.h"
 #include "components/autofill/core/common/password_form.h"
 #include "components/password_manager/core/browser/mock_password_store.h"
 #include "components/password_manager/core/browser/password_manager_test_utils.h"
 #include "ios/chrome/browser/browser_state/test_chrome_browser_state.h"
 #include "ios/chrome/browser/passwords/ios_chrome_password_store_factory.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_controller_test.h"
 #include "ios/web/public/test/test_web_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 @interface SavePasswordsCollectionViewController (InternalMethods)
 - (void)onGetPasswordStoreResults:
     (const std::vector<autofill::PasswordForm*>&)result;
 @end
 
 namespace {
 
 class SavePasswordsCollectionViewControllerTest
     : public CollectionViewControllerTest {
  protected:
   SavePasswordsCollectionViewControllerTest()
       : thread_bundle_(web::TestWebThreadBundle::REAL_DB_THREAD) {}
 
   void SetUp() override {
     TestChromeBrowserState::Builder test_cbs_builder;
     chrome_browser_state_ = test_cbs_builder.Build();
     CollectionViewControllerTest::SetUp();
     IOSChromePasswordStoreFactory::GetInstance()->SetTestingFactory(
         chrome_browser_state_.get(),
         &password_manager::BuildPasswordStore<
             web::BrowserState, password_manager::MockPasswordStore>);
     CreateController();
   }
 
-  CollectionViewController* NewController() override NS_RETURNS_RETAINED {
+  CollectionViewController* InstantiateController() override {
     return [[SavePasswordsCollectionViewController alloc]
         initWithBrowserState:chrome_browser_state_.get()];
   }
 
   // Adds a form to SavePasswordsTableViewController.
   void AddPasswordForm(autofill::PasswordForm* form) {
     SavePasswordsCollectionViewController* save_password_controller =
         static_cast<SavePasswordsCollectionViewController*>(controller());
     std::vector<autofill::PasswordForm*> passwords;
     passwords.push_back(form);
@@ skipping 117 matching lines @@
 
   // Delete item in blacklisted passwords section.
   deleteItemWithWait(2, 0);
   EXPECT_EQ(1, NumberOfItemsInSection(2));
   deleteItemWithWait(2, 0);
   // There should be no password sections remaining.
   EXPECT_EQ(2, NumberOfSections());
 }
 
 }  // namespace