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

ios/chrome/browser/ui/settings/time_range_selector_collection_view_controller_unittest.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 "ios/chrome/browser/ui/settings/time_range_selector_collection_view_controller.h"
 
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
 #include "components/browsing_data/core/pref_names.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 #include "components/sync_preferences/pref_service_mock_factory.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_text_item.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_controller_test.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/ocmock/OCMock/OCMock.h"
 #import "third_party/ocmock/gtest_support.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 @interface TimeRangeSelectorCollectionViewController (ExposedForTesting)
 - (void)updatePrefValue:(int)prefValue;
 @end
 
 namespace {
 
 const NSInteger kNumberOfItems = 5;
 
 class TimeRangeSelectorCollectionViewControllerTest
     : public CollectionViewControllerTest {
  protected:
   void SetUp() override {
     CollectionViewControllerTest::SetUp();
     pref_service_ = CreateLocalState();
-    delegate_.reset([[OCMockObject
+    delegate_ = [OCMockObject
         mockForProtocol:@protocol(
-                            TimeRangeSelectorCollectionViewControllerDelegate)]
-        retain]);
+                            TimeRangeSelectorCollectionViewControllerDelegate)];
     CreateController();
   }
 
-  CollectionViewController* NewController() override NS_RETURNS_RETAINED {
-    time_range_selector_controller_.reset(
+  CollectionViewController* InstantiateController() override {
+    time_range_selector_controller_ =
         [[TimeRangeSelectorCollectionViewController alloc]
             initWithPrefs:pref_service_.get()
-                 delegate:delegate_.get()]);
-    return [time_range_selector_controller_ retain];
+                 delegate:delegate_];
+    return time_range_selector_controller_;
   }
 
   std::unique_ptr<PrefService> CreateLocalState() {
     scoped_refptr<PrefRegistrySimple> registry(new PrefRegistrySimple());
     registry->RegisterIntegerPref(browsing_data::prefs::kDeleteTimePeriod, 0);
 
     sync_preferences::PrefServiceMockFactory factory;
     return factory.Create(registry.get());
   }
 
   // Verifies that the cell at |item| in |section| has the given |accessory|
   // type.
   void CheckTextItemAccessoryType(int accessory_type, int section, int item) {
     CollectionViewTextItem* cell = GetCollectionViewItem(section, item);
     EXPECT_EQ(accessory_type, cell.accessoryType);
   }
 
   base::MessageLoopForUI message_loop_;
   std::unique_ptr<PrefService> pref_service_;
-  base::scoped_nsobject<id> delegate_;
-  base::scoped_nsobject<TimeRangeSelectorCollectionViewController>
-      time_range_selector_controller_;
+  id delegate_;
+  TimeRangeSelectorCollectionViewController* time_range_selector_controller_;
 };
 
 TEST_F(TimeRangeSelectorCollectionViewControllerTest, TestModel) {
   CheckController();
   EXPECT_EQ(1, NumberOfSections());
 
   // No section header + 5 rows
   EXPECT_EQ(kNumberOfItems, NumberOfItemsInSection(0));
 
   CheckTextItemAccessoryType(MDCCollectionViewCellAccessoryCheckmark, 0, 0);
@@ skipping 28 matching lines @@
       } else {
         CheckTextItemAccessoryType(MDCCollectionViewCellAccessoryNone, 0, item);
       }
     }
   }
 }
 
 TEST_F(TimeRangeSelectorCollectionViewControllerTest, TestUpdatePrefValue) {
   CheckController();
   UICollectionView* collectionView =
-      time_range_selector_controller_.get().collectionView;
+      time_range_selector_controller_.collectionView;
   for (NSInteger checkedItem = 0; checkedItem < kNumberOfItems; ++checkedItem) {
     NSIndexPath* indexPath =
         [NSIndexPath indexPathForItem:checkedItem inSection:0];
-    [[delegate_.get() expect]
-        timeRangeSelectorViewController:time_range_selector_controller_.get()
+    [[delegate_ expect]
+        timeRangeSelectorViewController:time_range_selector_controller_
                     didSelectTimePeriod:static_cast<browsing_data::TimePeriod>(
                                             checkedItem)];
     [time_range_selector_controller_ collectionView:collectionView
                            didSelectItemAtIndexPath:indexPath];
     EXPECT_EQ(
         pref_service_->GetInteger(browsing_data::prefs::kDeleteTimePeriod),
         checkedItem);
     EXPECT_OCMOCK_VERIFY(delegate_);
   }
 }
 
 }  // namespace