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

ios/chrome/browser/web/progress_indicator_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/mac/foundation_util.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/time/time.h"
 #include "ios/chrome/browser/ui/ui_util.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_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/third_party/material_components_ios/src/components/ProgressView/src/MaterialProgressView.h"
 #import "ios/web/public/test/http_server.h"
 #import "ios/web/public/test/http_server_util.h"
 #include "ios/web/public/test/response_providers/html_response_provider.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;
 
 namespace {
 
 // Text to display in form page.
 const char kFormPageText[] = "Form testing page";
 
 // Text to display in infinite loading page.
 const char kPageText[] = "Navigation testing page";
 
@@ skipping 20 matching lines @@
     MDCProgressView* progressView = base::mac::ObjCCast<MDCProgressView>(view);
     return progressView && progressView.progress == progress;
   };
 
   DescribeToBlock describe = ^(id<GREYDescription> description) {
     [description
         appendText:[NSString stringWithFormat:@"progress view with progress:%f",
                                               progress]];
   };
 
-  return [[[GREYElementMatcherBlock alloc] initWithMatchesBlock:matches
-                                               descriptionBlock:describe]
-      autorelease];
+  return [[GREYElementMatcherBlock alloc] initWithMatchesBlock:matches
+                                              descriptionBlock:describe];
 }
 
 // Response provider that serves the page which never finishes loading.
 // TODO(crbug.com/638674): Evaluate if this can move to shared code.
 class InfinitePendingResponseProvider : public HtmlResponseProvider {
  public:
   explicit InfinitePendingResponseProvider(const GURL& url) : url_(url) {}
   ~InfinitePendingResponseProvider() override {}
 
   // HtmlResponseProvider overrides:
@@ skipping 172 matching lines @@
       assertWithMatcher:grey_notNil()];
 
   chrome_test_util::SubmitWebViewFormWithId(kFormID);
 
   // Verify progress view is not visible.
   [[EarlGrey selectElementWithMatcher:grey_kindOfClass([MDCProgressView class])]
       assertWithMatcher:grey_notVisible()];
 }
 
 @end