[ObjC ARC] Converts ios/chrome/browser/web:eg_tests to ARC.

ios/chrome/browser/web/visible_url_egtest.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 <EarlGrey/EarlGrey.h>
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/version_info/version_info.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
 #import "ios/chrome/browser/ui/commands/generic_chrome_command.h"
 #include "ios/chrome/browser/ui/commands/ios_command_ids.h"
 #include "ios/chrome/browser/ui/ui_util.h"
 #import "ios/chrome/test/app/chrome_test_util.h"
 #import "ios/chrome/test/earl_grey/chrome_earl_grey.h"
 #import "ios/chrome/test/earl_grey/chrome_earl_grey_ui.h"
 #import "ios/chrome/test/earl_grey/chrome_matchers.h"
 #import "ios/chrome/test/earl_grey/chrome_test_case.h"
 #import "ios/web/public/test/http_server.h"
 #include "ios/web/public/test/http_server_util.h"
 #include "ios/web/public/test/response_providers/html_response_provider.h"
 #include "ios/web/public/test/url_test_util.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 using chrome_test_util::WebViewContainingText;
 using chrome_test_util::OmniboxText;
 
 namespace {
 
 const char kTestPage1[] = "Test Page 1";
 const char kTestPage2[] = "Test Page 2";
 const char kTestPage3[] = "Test Page 3";
 const char kGoBackLink[] = "go-back";
 const char kGoForwardLink[] = "go-forward";
@@ skipping 476 matching lines @@
   // Tap the back button twice in the toolbar and wait for URL 1 to load.
   [[EarlGrey selectElementWithMatcher:chrome_test_util::BackButton()]
       performAction:grey_tap()];
   [[EarlGrey selectElementWithMatcher:chrome_test_util::BackButton()]
       performAction:grey_tap()];
   [[EarlGrey selectElementWithMatcher:WebViewContainingText(kTestPage1)]
       assertWithMatcher:grey_notNil()];
 
   // Quickly (using chrome command) navigate forward twice and wait for
   // kChromeUIVersionURL to load.
-  base::scoped_nsobject<GenericChromeCommand> forwardCommand(
-      [[GenericChromeCommand alloc] initWithTag:IDC_FORWARD]);
+  GenericChromeCommand* forwardCommand =
+      [[GenericChromeCommand alloc] initWithTag:IDC_FORWARD];
   chrome_test_util::RunCommandWithActiveViewController(forwardCommand);
   chrome_test_util::RunCommandWithActiveViewController(forwardCommand);
 
   const std::string version = version_info::GetVersionNumber();
   [[EarlGrey selectElementWithMatcher:WebViewContainingText(version)]
       assertWithMatcher:grey_notNil()];
 
   // Make sure that kChromeUIVersionURL URL is displayed in the omnibox.
   std::string expectedText = base::UTF16ToUTF8(web::GetDisplayTitleForUrl(URL));
   [[EarlGrey selectElementWithMatcher:OmniboxText(expectedText)]
@@ skipping 51 matching lines @@
 - (BOOL)waitForServerToReceiveRequestWithURL:(GURL)URL {
   return [[GREYCondition
       conditionWithName:@"Wait for received request"
                   block:^{
                     return _responseProvider->last_request_url() == URL ? YES
                                                                         : NO;
                   }] waitWithTimeout:10];
 }
 
 @end