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

ios/chrome/browser/ui/settings/autofill_profile_edit_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/autofill_profile_edit_collection_view_controller.h"
 
 #include <memory>
 
 #include "base/guid.h"
-#import "base/mac/scoped_nsobject.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/autofill/core/browser/autofill_profile.h"
 #include "components/autofill/core/browser/personal_data_manager.h"
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/browser/autofill/personal_data_manager_factory.h"
 #include "ios/chrome/browser/browser_state/test_chrome_browser_state.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
 #include "ios/chrome/browser/ui/settings/personal_data_manager_data_changed_observer.h"
 #include "ios/web/public/test/test_web_thread_bundle.h"
 #include "testing/platform_test.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 const char kTestFullName[] = "That Guy John";
 const char kTestAddressLine1[] = "Some person's garage";
 
 static NSArray* FindTextFieldDescendants(UIView* root) {
   NSMutableArray* textFields = [NSMutableArray array];
   NSMutableArray* descendants = [NSMutableArray array];
 
   [descendants addObject:root];
@@ skipping 30 matching lines @@
     autofill_profile =
         autofill::AutofillProfile(guid, "https://www.example.com/");
     autofill_profile.SetRawInfo(autofill::NAME_FULL,
                                 base::UTF8ToUTF16(kTestFullName));
     autofill_profile.SetRawInfo(autofill::ADDRESS_HOME_LINE1,
                                 base::UTF8ToUTF16(kTestAddressLine1));
 
     personal_data_manager_->SaveImportedProfile(autofill_profile);
     observer.Wait();  // Wait for the completion of the asynchronous operation.
 
-    autofill_profile_edit_controller_.reset(
-        [[AutofillProfileEditCollectionViewController
+    autofill_profile_edit_controller_ =
+        [AutofillProfileEditCollectionViewController
             controllerWithProfile:autofill_profile
-              personalDataManager:personal_data_manager_] retain]);
+              personalDataManager:personal_data_manager_];
   }
 
   web::TestWebThreadBundle thread_bundle_;
   std::unique_ptr<TestChromeBrowserState> chrome_browser_state_;
   autofill::PersonalDataManager* personal_data_manager_;
-  base::scoped_nsobject<AutofillProfileEditCollectionViewController>
+  AutofillProfileEditCollectionViewController*
       autofill_profile_edit_controller_;
 };
 
 // Default test case of no addresses or credit cards.
 // TODO(crbug.com/375196): This test is flaky.
 TEST_F(AutofillProfileEditCollectionViewControllerTest,
        FLAKY_TestInitialization) {
   CollectionViewModel* model =
       [autofill_profile_edit_controller_ collectionViewModel];
 
@@ skipping 32 matching lines @@
   EXPECT_TRUE([cell isKindOfClass:[MDCCollectionViewCell class]]);
   textFields = FindTextFieldDescendants(cell);
   EXPECT_TRUE([textFields count] > 0);
   field = [textFields objectAtIndex:0];
   EXPECT_TRUE([field isKindOfClass:[UITextField class]]);
   EXPECT_TRUE([[field text]
       isEqualToString:base::SysUTF8ToNSString(kTestAddressLine1)]);
 }
 
 }  // namespace