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

ios/web/web_state/ui/crw_wk_navigation_states_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/web/web_state/ui/crw_wk_navigation_states.h"
 
 #import <WebKit/WebKit.h>
 
-#import "base/mac/scoped_nsobject.h"
 #import "ios/web/web_state/navigation_context_impl.h"
 #include "net/http/http_response_headers.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 const char kTestUrl1[] = "https://test1.test/";
 const char kTestUrl2[] = "https://test2.test/";
 }
 
 namespace web {
 
 // Test fixture for CRWWKNavigationStates testing.
 class CRWWKNavigationStatesTest : public PlatformTest {
  protected:
   CRWWKNavigationStatesTest()
       : navigation1_(static_cast<WKNavigation*>([[NSObject alloc] init])),
         navigation2_(static_cast<WKNavigation*>([[NSObject alloc] init])),
         navigation3_(static_cast<WKNavigation*>([[NSObject alloc] init])),
         states_([[CRWWKNavigationStates alloc] init]) {}
 
  protected:
-  base::scoped_nsobject<WKNavigation> navigation1_;
-  base::scoped_nsobject<WKNavigation> navigation2_;
-  base::scoped_nsobject<WKNavigation> navigation3_;
-  base::scoped_nsobject<CRWWKNavigationStates> states_;
+  WKNavigation* navigation1_;
+  WKNavigation* navigation2_;
+  WKNavigation* navigation3_;
+  CRWWKNavigationStates* states_;
 };
 
 // Tests |removeNavigation:| method.
 TEST_F(CRWWKNavigationStatesTest, RemovingNavigation) {
   // navigation_1 is the only navigation and it is the latest.
   [states_ setState:WKNavigationState::REQUESTED forNavigation:navigation1_];
   ASSERT_EQ(navigation1_, [states_ lastAddedNavigation]);
   [states_ removeNavigation:navigation1_];
   ASSERT_FALSE([states_ lastAddedNavigation]);
 }
@@ skipping 49 matching lines @@
   EXPECT_EQ(GURL(kTestUrl1),
             [states_ contextForNavigation:navigation1_]->GetUrl());
   EXPECT_TRUE([states_ contextForNavigation:navigation1_]->IsSameDocument());
   EXPECT_FALSE([states_ contextForNavigation:navigation1_]->GetError());
 
   // Replace existing context.
   std::unique_ptr<web::NavigationContextImpl> context2 =
       NavigationContextImpl::CreateNavigationContext(
           nullptr /*web_state*/, GURL(kTestUrl2),
           ui::PageTransition::PAGE_TRANSITION_GENERATED);
-  NSError* error = [[[NSError alloc] init] autorelease];
+  NSError* error = [[NSError alloc] init];
   context2->SetError(error);
   [states_ setContext:std::move(context2) forNavigation:navigation1_];
   EXPECT_FALSE([states_ contextForNavigation:navigation2_]);
   EXPECT_FALSE([states_ contextForNavigation:navigation3_]);
   ASSERT_TRUE([states_ contextForNavigation:navigation1_]);
   EXPECT_EQ(GURL(kTestUrl2),
             [states_ contextForNavigation:navigation1_]->GetUrl());
   EXPECT_FALSE([states_ contextForNavigation:navigation1_]->IsSameDocument());
   EXPECT_EQ(error, [states_ contextForNavigation:navigation1_]->GetError());
 }
@@ skipping 69 matching lines @@
   [states_ removeNavigation:navigation2_];
   ASSERT_EQ(1U, [states_ pendingNavigations].count);
   EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation3_]);
 
   // Fail navigation_3.
   [states_ setState:WKNavigationState::FAILED forNavigation:navigation3_];
   ASSERT_EQ(0U, [states_ pendingNavigations].count);
 }
 
 }  // namespace web