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

ios/chrome/browser/ui/webui/web_ui_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 "base/mac/foundation_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/strings/grit/components_strings.h"
 #include "components/version_info/version_info.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
 #include "ios/chrome/browser/experimental_flags.h"
 #import "ios/chrome/browser/ui/omnibox/omnibox_text_field_ios.h"
 #include "ios/chrome/test/app/navigation_test_util.h"
 #include "ios/chrome/test/app/web_view_interaction_test_util.h"
 #import "ios/chrome/test/earl_grey/chrome_earl_grey.h"
 #import "ios/chrome/test/earl_grey/chrome_matchers.h"
 #import "ios/chrome/test/earl_grey/chrome_test_case.h"
 #import "ios/testing/wait_util.h"
 #import "ios/web/public/web_client.h"
 #include "ui/base/device_form_factor.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "url/scheme_host_port.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 using chrome_test_util::BackButton;
 using chrome_test_util::ForwardButton;
 using chrome_test_util::StaticHtmlViewContainingText;
 using chrome_test_util::TapWebViewElementWithId;
 using chrome_test_util::WebViewContainingText;
 
 namespace {
 
 // Loads WebUI page with given |host|.
 void LoadWebUIUrl(const std::string& host) {
@@ skipping 18 matching lines @@
                    }),
                @"Omnibox did not contain %@", base::SysUTF8ToNSString(text));
     return YES;
   };
 
   DescribeToBlock describe = ^(id<GREYDescription> description) {
     [description appendText:@"omnibox text "];
     [description appendText:base::SysUTF8ToNSString(text)];
   };
 
-  return grey_allOf(chrome_test_util::Omnibox(),
-                    [[[GREYElementMatcherBlock alloc]
-                        initWithMatchesBlock:matches
-                            descriptionBlock:describe] autorelease],
-                    nil);
+  return grey_allOf(
+      chrome_test_util::Omnibox(),
+      [[GREYElementMatcherBlock alloc] initWithMatchesBlock:matches
+                                           descriptionBlock:describe],
+      nil);
 }
 
 }  // namespace
 
 // Test case for chrome://* WebUI pages.
 @interface WebUITestCase : ChromeTestCase
 @end
 
 @implementation WebUITestCase
 
@@ skipping 130 matching lines @@
   [[EarlGrey selectElementWithMatcher:WaitForOmniboxText(kChromeInvalidURL)]
       assertWithMatcher:grey_sufficientlyVisible()];
   NSString* kError =
       l10n_util::GetNSString(IDS_ERRORPAGES_HEADING_NOT_AVAILABLE);
   id<GREYMatcher> messageMatcher = [GREYMatchers matcherForText:kError];
   [[EarlGrey selectElementWithMatcher:messageMatcher]
       assertWithMatcher:grey_notNil()];
 }
 
 @end