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

ios/chrome/browser/web/browsing_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 <XCTest/XCTest.h>
 #include <map>
 #include <memory>
 #include <string>
 
 #include "base/ios/ios_util.h"
@@ skipping 17 matching lines @@
 #import "ios/testing/wait_util.h"
 #import "ios/web/public/test/earl_grey/web_view_actions.h"
 #import "ios/web/public/test/earl_grey/web_view_matchers.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/data_response_provider.h"
 #include "net/http/http_response_headers.h"
 #include "ui/base/l10n/l10n_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::OmniboxText;
 using chrome_test_util::WebViewContainingText;
 
 namespace {
 
 // URL used for the reload test.
 const char kReloadTestUrl[] = "http://mock/reloadTest";
 
 // Returns the number of serviced requests in HTTP body.
 class ReloadResponseProvider : public web::DataResponseProvider {
@@ skipping 328 matching lines @@
       assertWithMatcher:grey_notNil()];
 
   [self goBack];
   [[EarlGrey selectElementWithMatcher:OmniboxText(URL.GetContent())]
       assertWithMatcher:grey_notNil()];
 }
 
 // TODO(crbug.com/638674): Evaluate if this can move to shared code
 // Navigates back to the previous webpage.
 - (void)goBack {
-  base::scoped_nsobject<GenericChromeCommand> backCommand(
-      [[GenericChromeCommand alloc] initWithTag:IDC_BACK]);
+  GenericChromeCommand* backCommand =
+      [[GenericChromeCommand alloc] initWithTag:IDC_BACK];
   chrome_test_util::RunCommandWithActiveViewController(backCommand);
 
   [ChromeEarlGrey waitForPageToFinishLoading];
 }
 
 // Navigates forward to a previous webpage.
 // TODO(crbug.com/638674): Evaluate if this can move to shared code
 - (void)goForward {
-  base::scoped_nsobject<GenericChromeCommand> forwardCommand(
-      [[GenericChromeCommand alloc] initWithTag:IDC_FORWARD]);
+  GenericChromeCommand* forwardCommand =
+      [[GenericChromeCommand alloc] initWithTag:IDC_FORWARD];
   chrome_test_util::RunCommandWithActiveViewController(forwardCommand);
 
   [ChromeEarlGrey waitForPageToFinishLoading];
 }
 
 // Tests that a link with WebUI URL does not trigger a load. WebUI pages may
 // have increased power and using the same web process (which may potentially
 // be controlled by an attacker) is dangerous.
 - (void)testTapLinkWithWebUIURL {
   // Create map of canned responses and set up the test HTML server.
@@ skipping 240 matching lines @@
 
   // Go back and verify that the browser navigates to the original URL.
   [self goBack];
   [[EarlGrey selectElementWithMatcher:WebViewContainingText("hello!")]
       assertWithMatcher:grey_notNil()];
   [[EarlGrey selectElementWithMatcher:OmniboxText(URL.GetContent())]
       assertWithMatcher:grey_notNil()];
 }
 
 @end