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

ios/chrome/browser/ui/settings/sync_create_passphrase_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/sync_create_passphrase_collection_view_controller.h"
 
 #import <UIKit/UIKit.h>
 
 #include "base/compiler_specific.h"
-#import "base/mac/scoped_nsobject.h"
 #import "base/test/ios/wait_util.h"
 #include "components/browser_sync/profile_sync_service_mock.h"
 #include "components/strings/grit/components_strings.h"
 #include "ios/chrome/browser/browser_state/test_chrome_browser_state.h"
 #import "ios/chrome/browser/ui/settings/cells/byo_textfield_item.h"
 #import "ios/chrome/browser/ui/settings/cells/passphrase_error_item.h"
 #import "ios/chrome/browser/ui/settings/passphrase_collection_view_controller_test.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 using testing::_;
 using testing::AtLeast;
 using testing::Return;
 
 class SyncCreatePassphraseCollectionViewControllerTest
     : public PassphraseCollectionViewControllerTest {
  public:
   SyncCreatePassphraseCollectionViewControllerTest() {}
 
  protected:
   void TearDown() override {
     [SyncController() stopObserving];
     PassphraseCollectionViewControllerTest::TearDown();
   }
 
-  CollectionViewController* NewController() override NS_RETURNS_RETAINED {
+  CollectionViewController* InstantiateController() override {
     return [[SyncCreatePassphraseCollectionViewController alloc]
         initWithBrowserState:chrome_browser_state_.get()];
   }
 
   SyncCreatePassphraseCollectionViewController* SyncController() {
     return static_cast<SyncCreatePassphraseCollectionViewController*>(
         controller());
   }
 };
 
@@ skipping 140 matching lines @@
 // Verifies that sync errors don't make the navigation item disappear.
 // Regression test for http://crbug.com/501784.
 TEST_F(SyncCreatePassphraseCollectionViewControllerTest,
        DISABLED_TestOnStateChangedError) {
   SyncCreatePassphraseCollectionViewController* sync_controller =
       SyncController();
   SetUpNavigationController(sync_controller);
   EXPECT_EQ([nav_controller_ topViewController], sync_controller);
   EXPECT_NE(nil, sync_controller.title);
   // Install a fake left button item, to check it's not removed.
-  base::scoped_nsobject<UIBarButtonItem> leftBarButtonItem(
+  UIBarButtonItem* leftBarButtonItem =
       [[UIBarButtonItem alloc] initWithTitle:@"Left"
                                        style:UIBarButtonItemStylePlain
                                       target:nil
-                                      action:nil]);
+                                      action:nil];
   sync_controller.navigationItem.leftBarButtonItem = leftBarButtonItem;
 
   // Set up the fake sync service to be in a passphrase creation state.
   ON_CALL(*fake_sync_service_, IsPassphraseRequired())
       .WillByDefault(Return(false));
   ON_CALL(*fake_sync_service_, IsUsingSecondaryPassphrase())
       .WillByDefault(Return(false));
   [sync_controller onSyncStateChanged];
   EXPECT_EQ([nav_controller_ topViewController], sync_controller);
   EXPECT_NE(nil, sync_controller.title);
-  EXPECT_EQ(leftBarButtonItem.get(),
+  EXPECT_EQ(leftBarButtonItem,
             sync_controller.navigationItem.leftBarButtonItem);
 }
 
 }  // namespace