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

ios/chrome/test/earl_grey/chrome_test_case.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/earl_grey/chrome_test_case.h"
 
 #import <objc/runtime.h>
 
 #import <EarlGrey/EarlGrey.h>
 
 #include "base/mac/scoped_block.h"
 #include "base/strings/sys_string_conversions.h"
 #import "ios/chrome/test/app/chrome_test_util.h"
 #include "ios/chrome/test/app/settings_test_util.h"
 #include "ios/chrome/test/app/signin_test_util.h"
 #import "ios/chrome/test/app/sync_test_util.h"
 #import "ios/chrome/test/app/tab_test_util.h"
 #import "ios/web/public/test/http_server.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 NSString* const kFlakyEarlGreyTestTargetSuffix = @"_flaky_egtests";
 
 // Contains a list of test names that run in multitasking test suite.
 NSArray* whiteListedMultitaskingTests = @[
   // Integration tests
   @"testContextMenuOpenInNewTab",        // ContextMenuTestCase
   @"testSwitchToMain",                   // CookiesTestCase
   @"testSwitchToIncognito",              // CookiesTestCase
@@ skipping 39 matching lines @@
   @"testOpenAndCloseToolsMenu",       // ToolsPopupMenuTestCase
   @"testUserFeedbackPageOpenPrivacyPolicy",  // UserFeedbackTestCase
   @"testVersion",                            // WebUITestCase
 ];
 
 const CFTimeInterval kDrainTimeout = 5;
 }  // namespace
 
 @interface ChromeTestCase () {
   // Block to be executed during object tearDown.
-  base::mac::ScopedBlock<ProceduralBlock> _tearDownHandler;
+  ProceduralBlock _tearDownHandler;
 
   BOOL _isHTTPServerStopped;
   BOOL _isMockAuthenticationDisabled;
 }
 
 // Cleans up mock authentication.
 + (void)disableMockAuthentication;
 
 // Sets up mock authentication.
 + (void)enableMockAuthentication;
@@ skipping 60 matching lines @@
   [[self class] disableMockAuthentication];
   [[self class] stopHTTPServer];
   [super tearDown];
 }
 
 // Set up called once per test, to open a new tab.
 - (void)setUp {
   [super setUp];
   _isHTTPServerStopped = NO;
   _isMockAuthenticationDisabled = NO;
-  _tearDownHandler.reset();
+  _tearDownHandler = nil;
 
   chrome_test_util::OpenNewTab();
   [[GREYUIThreadExecutor sharedInstance] drainUntilIdle];
 }
 
 // Tear down called once per test, to close all tabs and menus, and clear the
 // tracked tests accounts. It also makes sure mock authentication and the HTTP
 // server are running.
 - (void)tearDown {
   if (_tearDownHandler) {
-    _tearDownHandler.get()();
+    _tearDownHandler();
   }
 
   // Clear any remaining test accounts and signed in users.
   chrome_test_util::SignOutAndClearAccounts();
 
   // Re-start anything that was disabled this test, so it is running when the
   // next test starts.
   if (_isHTTPServerStopped) {
     [[self class] startHTTPServer];
     _isHTTPServerStopped = NO;
   }
   if (_isMockAuthenticationDisabled) {
     [[self class] enableMockAuthentication];
     _isMockAuthenticationDisabled = NO;
   }
 
   // Clean up any UI that may remain open so the next test starts in a clean
   // state.
   [[self class] removeAnyOpenMenusAndInfoBars];
   [[self class] closeAllTabs];
   [super tearDown];
 }
 
 #pragma mark - Public methods
 
 - (void)setTearDownHandler:(ProceduralBlock)tearDownHandler {
   // Enforce that only one |_tearDownHandler| is set per test.
   DCHECK(!_tearDownHandler);
-  _tearDownHandler.reset([tearDownHandler copy]);
+  _tearDownHandler = [tearDownHandler copy];
 }
 
 + (void)removeAnyOpenMenusAndInfoBars {
   chrome_test_util::RemoveAllInfoBars();
   chrome_test_util::ClearPresentedState();
   // After programatically removing UI elements, allow Earl Grey's
   // UI synchronization to become idle, so subsequent steps won't start before
   // the UI is in a good state.
   [[GREYUIThreadExecutor sharedInstance]
       drainUntilIdleWithTimeout:kDrainTimeout];
@@ skipping 83 matching lines @@
           [NSInvocation invocationWithMethodSignature:methodSignature];
       invocation.selector = selector;
       [multitaskingTestNames addObject:invocation];
     }
   }
   free(methods);
   return multitaskingTestNames;
 }
 
 @end