[Mac] Remove native/Cocoa preferences.

chrome/browser/autofill/autofill_credit_card_sheet_controller_mac_unittest.mm

-// Copyright (c) 2010 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/scoped_nsobject.h"
-#include "base/utf_string_conversions.h"
-#import "chrome/browser/autofill/autofill_credit_card_sheet_controller_mac.h"
-#include "chrome/browser/autofill/credit_card.h"
-#include "chrome/browser/ui/cocoa/browser_test_helper.h"
-#import "chrome/browser/ui/cocoa/cocoa_test_helper.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace {
-
-typedef CocoaTest AutoFillCreditCardSheetControllerTest;
-
-TEST(AutoFillCreditCardSheetControllerTest, Basic) {
-  // A basic test that creates a new instance and releases.
-  // Aids valgrind leak detection.
-  CreditCard credit_card;
-  scoped_nsobject<AutoFillCreditCardSheetController> controller(
-      [[AutoFillCreditCardSheetController alloc]
-          initWithCreditCard:credit_card
-                        mode:kAutoFillCreditCardAddMode]);
-  EXPECT_TRUE(controller.get());
-}
-
-}  // namespace
-