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

ios/chrome/browser/ui/ntp/new_tab_page_bar_unittest.mm

 // Copyright 2012 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.
 
-#include "base/mac/scoped_nsobject.h"
 #import "ios/chrome/browser/ui/ntp/new_tab_page_bar.h"
 #import "ios/chrome/browser/ui/ntp/new_tab_page_bar_item.h"
 #include "ios/chrome/browser/ui/ui_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 #import "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 NewTabPageBar (Testing)
 - (void)buttonDidTap:(UIButton*)button;
 @end
 
 namespace {
 
 class NewTabPageBarTest : public PlatformTest {
  protected:
   void SetUp() override {
     CGRect frame = CGRectMake(0, 0, 320, 44);
-    bar_.reset([[NewTabPageBar alloc] initWithFrame:frame]);
+    bar_ = [[NewTabPageBar alloc] initWithFrame:frame];
   };
-  base::scoped_nsobject<NewTabPageBar> bar_;
+  NewTabPageBar* bar_;
 };
 
 TEST_F(NewTabPageBarTest, SetItems) {
   NewTabPageBarItem* firstItem = [NewTabPageBarItem
       newTabPageBarItemWithTitle:@"First"
                       identifier:1
                            image:[UIImage imageNamed:@"ntp_bookmarks"]];
   // Tests that identifier test function can return both true and false.
   EXPECT_TRUE(firstItem.identifier == 1U);
 
   NewTabPageBarItem* secondItem = [NewTabPageBarItem
       newTabPageBarItemWithTitle:@"Second"
                       identifier:2
                            image:[UIImage imageNamed:@"ntp_bookmarks"]];
   NewTabPageBarItem* thirdItem = [NewTabPageBarItem
       newTabPageBarItemWithTitle:@"Third"
                       identifier:3
                            image:[UIImage imageNamed:@"ntp_bookmarks"]];
 
   [bar_ setItems:[NSArray arrayWithObject:firstItem]];
-  EXPECT_EQ(bar_.get().buttons.count, 1U);
+  EXPECT_EQ(bar_.buttons.count, 1U);
   [bar_ setItems:[NSArray arrayWithObjects:firstItem, secondItem, nil]];
-  EXPECT_EQ(bar_.get().buttons.count, 2U);
+  EXPECT_EQ(bar_.buttons.count, 2U);
   [bar_ setItems:[NSArray
                      arrayWithObjects:firstItem, secondItem, thirdItem, nil]];
-  EXPECT_EQ(bar_.get().buttons.count, 3U);
+  EXPECT_EQ(bar_.buttons.count, 3U);
   [bar_ setItems:[NSArray arrayWithObject:firstItem]];
-  EXPECT_EQ(bar_.get().buttons.count, 1U);
+  EXPECT_EQ(bar_.buttons.count, 1U);
 }
 
 TEST_F(NewTabPageBarTest, SetSelectedIndex_iPadOnly) {
   // Selected index isn't meaningful on iPhone.
   if (!IsIPadIdiom()) {
     return;
   }
 
   NewTabPageBarItem* firstItem = [NewTabPageBarItem
       newTabPageBarItemWithTitle:@"First"
@@ skipping 39 matching lines @@
   id uncalledDelegate =
       [OCMockObject niceMockForProtocol:@protocol(NewTabPageBarDelegate)];
   [[uncalledDelegate reject] newTabBarItemDidChange:OCMOCK_ANY changePanel:YES];
   [bar_ setDelegate:uncalledDelegate];
   [bar_ setSelectedIndex:2];
   EXPECT_TRUE([[[bar_ buttons] objectAtIndex:2] isSelected]);
   EXPECT_OCMOCK_VERIFY(uncalledDelegate);
 }
 
 }  // anonymous namespace