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

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

 // Copyright 2012 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_encryption_passphrase_collection_view_controller.h"
 
 #import <UIKit/UIKit.h>
 
 #include <memory>
 
 #include "base/compiler_specific.h"
-#import "base/mac/scoped_nsobject.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/sys_string_conversions.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"
 #include "ios/chrome/browser/sync/ios_chrome_profile_sync_service_factory.h"
 #include "ios/chrome/browser/sync/sync_setup_service.h"
 #include "ios/chrome/browser/sync/sync_setup_service_factory.h"
 #include "ios/chrome/browser/sync/sync_setup_service_mock.h"
 #import "ios/chrome/browser/ui/settings/cells/byo_textfield_item.h"
 #import "ios/chrome/browser/ui/settings/cells/card_multiline_item.h"
 #import "ios/chrome/browser/ui/settings/passphrase_collection_view_controller_test.h"
 #import "ios/chrome/browser/ui/sync/sync_util.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::NiceMock;
 using testing::Return;
 
 class SyncEncryptionPassphraseCollectionViewControllerTest
     : public PassphraseCollectionViewControllerTest {
  public:
@@ skipping 35 matching lines @@
     // will by default return false.  GetSyncServiceState(), however, returns an
     // enum, and thus always needs its default value set.
     TurnSyncErrorOff();
   };
 
   void TearDown() override {
     [SyncController() stopObserving];
     PassphraseCollectionViewControllerTest::TearDown();
   }
 
-  CollectionViewController* NewController() override NS_RETURNS_RETAINED {
+  CollectionViewController* InstantiateController() override {
     return [[SyncEncryptionPassphraseCollectionViewController alloc]
         initWithBrowserState:chrome_browser_state_.get()];
   }
 
   SyncEncryptionPassphraseCollectionViewController* SyncController() {
     return static_cast<SyncEncryptionPassphraseCollectionViewController*>(
         controller());
   }
 
   // Weak, owned by |profile_|.
@@ skipping 130 matching lines @@
   EXPECT_FALSE([sync_controller syncErrorMessage]);
   TurnSyncOtherErrorOn(otherState);
   EXPECT_NSEQ(ios_internal::sync::GetSyncErrorMessageForBrowserState(
                   chrome_browser_state_.get()),
               [sync_controller syncErrorMessage]);
   TurnSyncErrorOff();
   EXPECT_FALSE([sync_controller syncErrorMessage]);
 }
 
 }  // namespace