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

ios/chrome/browser/ui/reading_list/reading_list_coordinator_unittest.mm

Index: ios/chrome/browser/ui/reading_list/reading_list_coordinator_unittest.mm
diff --git a/ios/chrome/browser/ui/reading_list/reading_list_coordinator_unittest.mm b/ios/chrome/browser/ui/reading_list/reading_list_coordinator_unittest.mm
index da2d45c13090cee64f058518e3ef7548c2c755f2..fa3f0acf18526263753e9529625b5d6010e02f9a 100644
--- a/ios/chrome/browser/ui/reading_list/reading_list_coordinator_unittest.mm
+++ b/ios/chrome/browser/ui/reading_list/reading_list_coordinator_unittest.mm
@@ -4,7 +4,6 @@
 
 #import "ios/chrome/browser/ui/reading_list/reading_list_coordinator.h"
 
-#include "base/mac/scoped_nsobject.h"
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/default_clock.h"
@@ -26,6 +25,10 @@
 #import "third_party/ocmock/gtest_support.h"
 #include "ui/base/page_transition_types.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 using favicon::PostReply;
 using testing::_;
 
@@ -92,22 +95,22 @@ using testing::_;
 class ReadingListCoordinatorTest : public web::WebTestWithWebState {
  public:
   ReadingListCoordinatorTest() {
-    loader_mock_.reset([[UrlLoaderStub alloc] init]);
+    loader_mock_ = [[UrlLoaderStub alloc] init];
 
     TestChromeBrowserState::Builder builder;
     browser_state_ = builder.Build();
 
     reading_list_model_.reset(new ReadingListModelImpl(
         nullptr, nullptr, base::MakeUnique<base::DefaultClock>()));
-    mediator_.reset(
-        [[ReadingListMediator alloc] initWithModel:reading_list_model_.get()]);
+    mediator_ =
+        [[ReadingListMediator alloc] initWithModel:reading_list_model_.get()];
     large_icon_service_.reset(new favicon::LargeIconService(
         &mock_favicon_service_, base::ThreadTaskRunnerHandle::Get(),
         /*image_fetcher=*/nullptr));
-    coordinator_.reset([[ReadingListCoordinator alloc]
+    coordinator_ = [[ReadingListCoordinator alloc]
         initWithBaseViewController:nil
                       browserState:browser_state_.get()
-                            loader:loader_mock_]);
+                            loader:loader_mock_];
 
     EXPECT_CALL(mock_favicon_service_,
                 GetLargestRawFaviconForPageURL(_, _, _, _, _))
@@ -123,17 +126,17 @@ class ReadingListCoordinatorTest : public web::WebTestWithWebState {
 
   ReadingListCollectionViewController*
   GetAReadingListCollectionViewController() {
-    return [[[ReadingListCollectionViewController alloc]
+    return [[ReadingListCollectionViewController alloc]
         initWithDataSource:mediator_
           largeIconService:large_icon_service_.get()
-                   toolbar:nil] autorelease];
+                   toolbar:nil];
   }
 
  private:
-  base::scoped_nsobject<ReadingListCoordinator> coordinator_;
-  base::scoped_nsobject<ReadingListMediator> mediator_;
+  ReadingListCoordinator* coordinator_;
+  ReadingListMediator* mediator_;
   std::unique_ptr<ReadingListModelImpl> reading_list_model_;
-  base::scoped_nsobject<UrlLoaderStub> loader_mock_;
+  UrlLoaderStub* loader_mock_;
   testing::StrictMock<favicon::MockFaviconService> mock_favicon_service_;
   std::unique_ptr<favicon::LargeIconService> large_icon_service_;
   std::unique_ptr<TestChromeBrowserState> browser_state_;
@@ -150,11 +153,10 @@ TEST_F(ReadingListCoordinatorTest, OpenItem) {
   ReadingListModel* model = GetReadingListModel();
   model->AddEntry(url, title, reading_list::ADDED_VIA_CURRENT_APP);
 
-  base::scoped_nsobject<ReadingListCollectionViewItem> item(
-      [[ReadingListCollectionViewItem alloc]
-               initWithType:0
-                        url:url
-          distillationState:ReadingListUIDistillationStatusSuccess]);
+  ReadingListCollectionViewItem* item = [[ReadingListCollectionViewItem alloc]
+           initWithType:0
+                    url:url
+      distillationState:ReadingListUIDistillationStatusSuccess];
 
   // Action.
   [GetCoordinator() readingListCollectionViewController: