[ObjC ARC] Converts ios/web:ios_web_navigation_unittests to ARC.

ios/web/navigation/crw_navigation_item_storage_unittest.mm

 // Copyright 2017 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/web/public/crw_navigation_item_storage.h"
 
 #import <Foundation/Foundation.h>
 #include <stdint.h>
 
 #include <utility>
 
-#import "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #import "ios/web/navigation/navigation_item_impl.h"
 #import "ios/web/navigation/navigation_item_storage_test_util.h"
 #include "ios/web/public/referrer.h"
 #import "net/base/mac/url_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 #include "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
+
 class CRWNavigationItemStorageTest : public PlatformTest {
  protected:
   CRWNavigationItemStorageTest()
       : item_storage_([[CRWNavigationItemStorage alloc] init]) {
     // Set up |item_storage_|.
     [item_storage_ setVirtualURL:GURL("http://init.test")];
     [item_storage_ setReferrer:web::Referrer(GURL("http://referrer.url"),
                                              web::ReferrerPolicyDefault)];
     [item_storage_ setTimestamp:base::Time::Now()];
     [item_storage_ setTitle:base::SysNSStringToUTF16(@"Title")];
     [item_storage_
         setDisplayState:web::PageDisplayState(0.0, 0.0, 0.0, 0.0, 0.0)];
     [item_storage_
         setPOSTData:[@"Test data" dataUsingEncoding:NSUTF8StringEncoding]];
     [item_storage_ setHTTPRequestHeaders:@{ @"HeaderKey" : @"HeaderValue" }];
     [item_storage_ setUserAgentType:web::UserAgentType::DESKTOP];
   }
 
   // Convenience getter to facilitate dot notation in tests.
   CRWNavigationItemStorage* item_storage() { return item_storage_; }
 
  protected:
-  base::scoped_nsobject<CRWNavigationItemStorage> item_storage_;
+  CRWNavigationItemStorage* item_storage_;
 };
 
 // Tests initializing with the legacy keys.
 TEST_F(CRWNavigationItemStorageTest, InitWithCoderLegacy) {
   NSURL* virtualURL = net::NSURLWithGURL(item_storage().virtualURL);
   NSURL* referrerURL = net::NSURLWithGURL(item_storage().referrer.url);
   NSString* title = base::SysUTF16ToNSString(item_storage().title);
   // Legacy NavigationItems don't persist timestamp.
   item_storage().timestamp = base::Time::FromCFAbsoluteTime(0);
 
   // Set up archiver and unarchiver.
-  base::scoped_nsobject<NSMutableData> data([[NSMutableData alloc] init]);
-  base::scoped_nsobject<NSKeyedArchiver> archiver(
-      [[NSKeyedArchiver alloc] initForWritingWithMutableData:data]);
+  NSMutableData* data = [[NSMutableData alloc] init];
+  NSKeyedArchiver* archiver =
+      [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
   [archiver encodeObject:virtualURL
                   forKey:web::kNavigationItemStorageURLDeperecatedKey];
   [archiver encodeObject:referrerURL
                   forKey:web::kNavigationItemStorageReferrerURLDeprecatedKey];
   [archiver encodeObject:title forKey:web::kNavigationItemStorageTitleKey];
   NSDictionary* display_state_dict =
       item_storage().displayState.GetSerialization();
   [archiver encodeObject:display_state_dict
                   forKey:web::kNavigationItemStoragePageDisplayStateKey];
   [archiver
       encodeBool:YES
           forKey:web::kNavigationItemStorageUseDesktopUserAgentDeprecatedKey];
   NSDictionary* request_headers = item_storage().HTTPRequestHeaders;
   [archiver encodeObject:request_headers
                   forKey:web::kNavigationItemStorageHTTPRequestHeadersKey];
   [archiver encodeObject:item_storage().POSTData
                   forKey:web::kNavigationItemStoragePOSTDataKey];
   BOOL skip_repost_form_confirmation =
       item_storage().shouldSkipRepostFormConfirmation;
   [archiver
       encodeBool:skip_repost_form_confirmation
           forKey:web::kNavigationItemStorageSkipRepostFormConfirmationKey];
   [archiver finishEncoding];
-  base::scoped_nsobject<NSKeyedUnarchiver> unarchiver(
-      [[NSKeyedUnarchiver alloc] initForReadingWithData:data]);
+  NSKeyedUnarchiver* unarchiver =
+      [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
 
   // Create a CRWNavigationItemStorage and verify that it is equivalent.
-  base::scoped_nsobject<CRWNavigationItemStorage> new_storage(
-      [[CRWNavigationItemStorage alloc] initWithCoder:unarchiver]);
-  EXPECT_TRUE(web::ItemStoragesAreEqual(item_storage(), new_storage.get()));
+  CRWNavigationItemStorage* new_storage =
+      [[CRWNavigationItemStorage alloc] initWithCoder:unarchiver];
+  EXPECT_TRUE(web::ItemStoragesAreEqual(item_storage(), new_storage));
 }
 
 // Tests that unarchiving CRWNavigationItemStorage data results in an equivalent
 // storage.
 TEST_F(CRWNavigationItemStorageTest, EncodeDecode) {
   NSData* data = [NSKeyedArchiver archivedDataWithRootObject:item_storage()];
   id decoded = [NSKeyedUnarchiver unarchiveObjectWithData:data];
   EXPECT_TRUE(web::ItemStoragesAreEqual(item_storage(), decoded));
 }