[ObjC ARC] Converts ios/chrome/test/app:test_support to ARC.

ios/chrome/test/app/tab_test_util.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/chrome/test/app/tab_test_util.h"
 
 #import <Foundation/Foundation.h>
 
 #import "base/mac/foundation_util.h"
-#import "base/mac/scoped_nsobject.h"
 #import "ios/chrome/app/main_controller_private.h"
 #import "ios/chrome/browser/autofill/form_input_accessory_view_controller.h"
 #include "ios/chrome/browser/experimental_flags.h"
 #import "ios/chrome/browser/metrics/tab_usage_recorder.h"
 #import "ios/chrome/browser/tabs/tab.h"
 #import "ios/chrome/browser/tabs/tab_model.h"
 #import "ios/chrome/browser/tabs/tab_private.h"
 #import "ios/chrome/browser/ui/browser_view_controller.h"
 #import "ios/chrome/browser/ui/commands/generic_chrome_command.h"
 #include "ios/chrome/browser/ui/commands/ios_command_ids.h"
 #import "ios/chrome/browser/ui/tabs/tab_strip_controller_private.h"
 #import "ios/chrome/test/app/chrome_test_util.h"
 #import "ios/testing/wait_util.h"
+#import "ios/web/web_state/ui/crw_web_controller.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
 
 namespace chrome_test_util {
 
 namespace {
 
 // Returns the tab model for the current mode (incognito or normal).
 TabModel* GetCurrentTabModel() {
   return IsIncognitoMode()
              ? [[GetMainController() browserViewInformation] otrTabModel]
              : [[GetMainController() browserViewInformation] mainTabModel];
 }
 
 }  // namespace
 
 BOOL IsIncognitoMode() {
   MainController* main_controller = GetMainController();
   BrowserViewController* otr_bvc =
       [[main_controller browserViewInformation] otrBVC];
   BrowserViewController* current_bvc =
       [[main_controller browserViewInformation] currentBVC];
   return otr_bvc == current_bvc;
 }
 
 void OpenNewTab() {
   @autoreleasepool {  // Make sure that all internals are deallocated.
-    base::scoped_nsobject<GenericChromeCommand> command(
-        [[GenericChromeCommand alloc] initWithTag:IDC_NEW_TAB]);
+    GenericChromeCommand* command =
+        [[GenericChromeCommand alloc] initWithTag:IDC_NEW_TAB];
     chrome_test_util::RunCommandWithActiveViewController(command);
   }
 }
 
 void OpenNewIncognitoTab() {
   @autoreleasepool {  // Make sure that all internals are deallocated.
-    base::scoped_nsobject<GenericChromeCommand> command(
-        [[GenericChromeCommand alloc] initWithTag:IDC_NEW_INCOGNITO_TAB]);
+    GenericChromeCommand* command =
+        [[GenericChromeCommand alloc] initWithTag:IDC_NEW_INCOGNITO_TAB];
     chrome_test_util::RunCommandWithActiveViewController(command);
   }
 }
 
 Tab* GetCurrentTab() {
   TabModel* tab_model = GetCurrentTabModel();
   return tab_model.currentTab;
 }
 
 Tab* GetNextTab() {
@@ skipping 115 matching lines @@
   return [[GetMainController() browserViewInformation] mainTabModel]
       .tabUsageRecorder->EvictedTabsMapSize();
 }
 
 FormInputAccessoryViewController* GetInputAccessoryViewController() {
   Tab* current_tab = GetCurrentTab();
   return [current_tab inputAccessoryViewController];
 }
 
 }  // namespace chrome_test_util