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

ios/chrome/browser/ui/preload_controller_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 <memory>
 
 #include "base/ios/device_util.h"
-#include "base/mac/scoped_nsobject.h"
 #include "base/run_loop.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/prefs/pref_service.h"
 #include "ios/chrome/browser/browser_state/test_chrome_browser_state.h"
 #include "ios/chrome/browser/pref_names.h"
 #import "ios/chrome/browser/ui/preload_controller.h"
 #include "ios/web/public/test/test_web_thread_bundle.h"
 #include "net/url_request/test_url_fetcher_factory.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/platform_test.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 @interface PreloadController (ExposedForTesting)
 - (BOOL)shouldPreloadURL:(const GURL&)url;
 - (BOOL)isPrerenderingEnabled;
 - (BOOL)isPrefetchingEnabled;
 - (const GURL)urlToPrefetchURL:(const GURL&)url;
 - (BOOL)hasPrefetchedURL:(const GURL&)url;
 @end
 
 namespace {
 
@@ skipping 30 matching lines @@
  protected:
   void SetUp() override {
     TestChromeBrowserState::Builder test_cbs_builder;
     chrome_browser_state_ = test_cbs_builder.Build();
     // Set up a NetworkChangeNotifier so that the test can simulate Wi-Fi vs.
     // cellular connection.
     network_change_notifier_.reset(new TestNetworkChangeNotifier);
 
     test_url_fetcher_factory_.reset(new net::TestURLFetcherFactory());
 
-    controller_.reset([[PreloadController alloc]
-        initWithBrowserState:chrome_browser_state_.get()]);
+    controller_ = [[PreloadController alloc]
+        initWithBrowserState:chrome_browser_state_.get()];
   };
 
   // Set the "Preload webpages" setting to "Always".
   void PreloadWebpagesAlways() {
     chrome_browser_state_->GetPrefs()->SetBoolean(
         prefs::kNetworkPredictionEnabled, YES);
     chrome_browser_state_->GetPrefs()->SetBoolean(
         prefs::kNetworkPredictionWifiOnly, NO);
   }
 
@@ skipping 18 matching lines @@
 
   void SimulateCellularConnection() {
     network_change_notifier_->SimulateNetworkConnectionChange(
         net::NetworkChangeNotifier::CONNECTION_3G);
   }
 
   web::TestWebThreadBundle thread_bundle_;
   std::unique_ptr<TestChromeBrowserState> chrome_browser_state_;
   std::unique_ptr<TestNetworkChangeNotifier> network_change_notifier_;
   std::unique_ptr<net::TestURLFetcherFactory> test_url_fetcher_factory_;
-  base::scoped_nsobject<PreloadController> controller_;
+  PreloadController* controller_;
 };
 
 // Tests that the preload controller does not try to preload non-web urls.
 TEST_F(PreloadControllerTest, ShouldPreloadURL) {
   EXPECT_TRUE([controller_ shouldPreloadURL:GURL("http://www.google.com/")]);
   EXPECT_TRUE([controller_ shouldPreloadURL:GURL("https://www.google.com/")]);
 
   EXPECT_FALSE([controller_ shouldPreloadURL:GURL()]);
   EXPECT_FALSE([controller_ shouldPreloadURL:GURL("chrome://newtab")]);
   EXPECT_FALSE([controller_ shouldPreloadURL:GURL("about:flags")]);
@@ skipping 132 matching lines @@
 
   // Prefetch |second| and verify it's the only one that returns true.
   [controller_ prefetchURL:second
                 transition:ui::PAGE_TRANSITION_FROM_ADDRESS_BAR];
   EXPECT_FALSE([controller_ hasPrefetchedURL:first]);
   EXPECT_TRUE([controller_ hasPrefetchedURL:second]);
   EXPECT_FALSE([controller_ hasPrefetchedURL:bogus]);
 }
 
 }  // anonymous namespace