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

ios/chrome/browser/ui/tools_menu/tools_menu_view_item_unittest.mm

 // Copyright 2013 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/tools_menu/tools_menu_view_item.h"
 
 #import <UIKit/UIKit.h>
 
-#include "base/mac/scoped_nsobject.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 class ToolsMenuViewItemTest : public PlatformTest {
  protected:
   void SetUp() override {
-    toolsMenuViewItem_.reset([[ToolsMenuViewItem alloc] init]);
+    toolsMenuViewItem_ = [[ToolsMenuViewItem alloc] init];
   }
-  base::scoped_nsobject<ToolsMenuViewItem> toolsMenuViewItem_;
+  ToolsMenuViewItem* toolsMenuViewItem_;
 };
 
 TEST_F(ToolsMenuViewItemTest, CustomizeCellAccessibilityTrait) {
-  base::scoped_nsobject<ToolsMenuViewCell> cell1(
-      [[ToolsMenuViewCell alloc] init]);
-  base::scoped_nsobject<ToolsMenuViewCell> cell2(
-      [[ToolsMenuViewCell alloc] init]);
+  ToolsMenuViewCell* cell1 = [[ToolsMenuViewCell alloc] init];
+  ToolsMenuViewCell* cell2 = [[ToolsMenuViewCell alloc] init];
 
   [toolsMenuViewItem_ setActive:YES];
   [cell1 setAccessibilityTraits:UIAccessibilityTraitNotEnabled];
   [cell1 configureForMenuItem:toolsMenuViewItem_];
-  EXPECT_FALSE(cell1.get().accessibilityTraits &
-               UIAccessibilityTraitNotEnabled);
+  EXPECT_FALSE(cell1.accessibilityTraits & UIAccessibilityTraitNotEnabled);
 
   [toolsMenuViewItem_ setActive:NO];
   [cell2 configureForMenuItem:toolsMenuViewItem_];
-  EXPECT_TRUE(cell2.get().accessibilityTraits & UIAccessibilityTraitNotEnabled);
+  EXPECT_TRUE(cell2.accessibilityTraits & UIAccessibilityTraitNotEnabled);
 
   // Happens when cell2 is reused.
   [toolsMenuViewItem_ setActive:YES];
   [cell2 configureForMenuItem:toolsMenuViewItem_];
-  EXPECT_FALSE(cell2.get().accessibilityTraits &
-               UIAccessibilityTraitNotEnabled);
+  EXPECT_FALSE(cell2.accessibilityTraits & UIAccessibilityTraitNotEnabled);
 }
 
 }  // namespace