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

ios/chrome/browser/ui/collection_view/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/collection_view/collection_view_controller.h"
 
-#include "base/ios/weak_nsobject.h"
-#import "base/mac/scoped_nsobject.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
 #import "ios/chrome/test/base/scoped_block_swizzler.h"
 #include "ios/chrome/test/block_cleanup_test.h"
 #import "ios/third_party/material_components_ios/src/components/CollectionCells/src/MaterialCollectionCells.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 // Checks that key methods are called.
 // CollectionViewItem can't easily be mocked via OCMock as one of the methods to
 // mock returns a Class type.
 @interface MockCollectionViewItem : CollectionViewItem
 @property(nonatomic, assign) BOOL configureCellCalled;
 @end
 
 @implementation MockCollectionViewItem
 
 @synthesize configureCellCalled = _configureCellCalled;
@@ skipping 14 matching lines @@
 typedef NS_ENUM(NSInteger, ItemType) {
   ItemTypeFooBar = kItemTypeEnumZero,
   ItemTypeFooBiz,
 };
 
 class CollectionViewControllerTest : public BlockCleanupTest {};
 
 }  // namespace
 
 TEST_F(CollectionViewControllerTest, InitDefaultStyle) {
-  base::scoped_nsobject<CollectionViewController> controller(
-      [[CollectionViewController alloc]
-          initWithStyle:CollectionViewControllerStyleDefault]);
-  EXPECT_EQ(nil, controller.get().appBar);
+  CollectionViewController* controller = [[CollectionViewController alloc]
+      initWithStyle:CollectionViewControllerStyleDefault];
+  EXPECT_EQ(nil, controller.appBar);
 }
 
 TEST_F(CollectionViewControllerTest, InitAppBarStyle) {
-  base::scoped_nsobject<CollectionViewController> controller(
-      [[CollectionViewController alloc]
-          initWithStyle:CollectionViewControllerStyleAppBar]);
-  EXPECT_NE(nil, controller.get().appBar);
+  CollectionViewController* controller = [[CollectionViewController alloc]
+      initWithStyle:CollectionViewControllerStyleAppBar];
+  EXPECT_NE(nil, controller.appBar);
 }
 
 TEST_F(CollectionViewControllerTest, CellForItemAtIndexPath) {
-  base::scoped_nsobject<CollectionViewController> controller(
-      [[CollectionViewController alloc]
-          initWithStyle:CollectionViewControllerStyleDefault]);
+  CollectionViewController* controller = [[CollectionViewController alloc]
+      initWithStyle:CollectionViewControllerStyleDefault];
   [controller loadModel];
 
   [[controller collectionViewModel]
       addSectionWithIdentifier:SectionIdentifierFoo];
-  base::scoped_nsobject<MockCollectionViewItem> someItem(
-      [[MockCollectionViewItem alloc] initWithType:ItemTypeFooBar]);
+  MockCollectionViewItem* someItem =
+      [[MockCollectionViewItem alloc] initWithType:ItemTypeFooBar];
   [[controller collectionViewModel] addItem:someItem
                     toSectionWithIdentifier:SectionIdentifierFoo];
 
   ASSERT_EQ(NO, [someItem configureCellCalled]);
   [controller collectionView:[controller collectionView]
       cellForItemAtIndexPath:[NSIndexPath indexPathForItem:0 inSection:0]];
   EXPECT_EQ(YES, [someItem configureCellCalled]);
 }
 
 TEST_F(CollectionViewControllerTest, ReconfigureCells) {
-  base::scoped_nsobject<CollectionViewController> controller(
-      [[CollectionViewController alloc]
-          initWithStyle:CollectionViewControllerStyleDefault]);
+  CollectionViewController* controller = [[CollectionViewController alloc]
+      initWithStyle:CollectionViewControllerStyleDefault];
   [controller loadModel];
 
   CollectionViewModel* model = [controller collectionViewModel];
   [model addSectionWithIdentifier:SectionIdentifierFoo];
 
-  base::scoped_nsobject<MockCollectionViewItem> firstReconfiguredItem(
-      [[MockCollectionViewItem alloc] initWithType:ItemTypeFooBar]);
+  MockCollectionViewItem* firstReconfiguredItem =
+      [[MockCollectionViewItem alloc] initWithType:ItemTypeFooBar];
   [model addItem:firstReconfiguredItem
       toSectionWithIdentifier:SectionIdentifierFoo];
 
-  base::scoped_nsobject<MockCollectionViewItem> secondReconfiguredItem(
-      [[MockCollectionViewItem alloc] initWithType:ItemTypeFooBiz]);
+  MockCollectionViewItem* secondReconfiguredItem =
+      [[MockCollectionViewItem alloc] initWithType:ItemTypeFooBiz];
   [model addItem:secondReconfiguredItem
       toSectionWithIdentifier:SectionIdentifierFoo];
 
-  base::scoped_nsobject<MockCollectionViewItem> firstNonReconfiguredItem(
-      [[MockCollectionViewItem alloc] initWithType:ItemTypeFooBiz]);
+  MockCollectionViewItem* firstNonReconfiguredItem =
+      [[MockCollectionViewItem alloc] initWithType:ItemTypeFooBiz];
   [model addItem:firstNonReconfiguredItem
       toSectionWithIdentifier:SectionIdentifierFoo];
 
-  base::scoped_nsobject<MockCollectionViewItem> thirdReconfiguredItem(
-      [[MockCollectionViewItem alloc] initWithType:ItemTypeFooBiz]);
+  MockCollectionViewItem* thirdReconfiguredItem =
+      [[MockCollectionViewItem alloc] initWithType:ItemTypeFooBiz];
   [model addItem:thirdReconfiguredItem
       toSectionWithIdentifier:SectionIdentifierFoo];
 
-  base::scoped_nsobject<MockCollectionViewItem> secondNonReconfiguredItem(
-      [[MockCollectionViewItem alloc] initWithType:ItemTypeFooBiz]);
+  MockCollectionViewItem* secondNonReconfiguredItem =
+      [[MockCollectionViewItem alloc] initWithType:ItemTypeFooBiz];
   [model addItem:secondNonReconfiguredItem
       toSectionWithIdentifier:SectionIdentifierFoo];
 
   // The collection view is not visible on screen, so it has not created any of
   // its cells.  Swizzle |cellsForItemAtIndexPath:| and inject an implementation
   // for testing that always returns a non-nil cell.
-  base::scoped_nsobject<MDCCollectionViewCell> dummyCell(
-      [[MDCCollectionViewCell alloc] init]);
+  MDCCollectionViewCell* dummyCell = [[MDCCollectionViewCell alloc] init];
   {
     ScopedBlockSwizzler swizzler([UICollectionView class],
                                  @selector(cellForItemAtIndexPath:),
                                  ^(id self) {
-                                   return dummyCell.get();
+                                   return dummyCell;
                                  });
 
     NSArray* itemsToReconfigure = @[
       firstReconfiguredItem, secondReconfiguredItem, thirdReconfiguredItem
     ];
     [controller reconfigureCellsForItems:itemsToReconfigure
                  inSectionWithIdentifier:SectionIdentifierFoo];
   }
 
   EXPECT_TRUE([firstReconfiguredItem configureCellCalled]);
   EXPECT_TRUE([secondReconfiguredItem configureCellCalled]);
   EXPECT_TRUE([thirdReconfiguredItem configureCellCalled]);
 
   EXPECT_FALSE([firstNonReconfiguredItem configureCellCalled]);
   EXPECT_FALSE([secondNonReconfiguredItem configureCellCalled]);
 }