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

ios/chrome/test/earl_grey/chrome_earl_grey_ui.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_earl_grey_ui.h"
 
 #import "ios/chrome/browser/ui/tools_menu/tools_menu_view_controller.h"
 #import "ios/chrome/browser/ui/uikit_ui_util.h"
 #import "ios/chrome/test/app/chrome_test_util.h"
 #include "ios/chrome/test/app/navigation_test_util.h"
 #import "ios/chrome/test/earl_grey/chrome_matchers.h"
 #import "ios/testing/wait_util.h"
 #import "ios/web/public/test/earl_grey/js_test_util.h"
 #import "ios/web/public/test/earl_grey/web_view_matchers.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 using testing::WaitUntilConditionOrTimeout;
 using testing::kWaitForPageLoadTimeout;
 
 @implementation ChromeEarlGreyUI
 
 + (void)openToolsMenu {
   // TODO(crbug.com/685570): Fix the tap instead of adding a delay.
   GREYCondition* myCondition = [GREYCondition
       conditionWithName:@"Delay to ensure the toolbar menu can be opened"
                   block:^BOOL {
@@ skipping 43 matching lines @@
 
 + (void)openShareMenu {
   if (IsCompact()) {
     [ChromeEarlGreyUI openToolsMenu];
   }
   [[EarlGrey selectElementWithMatcher:chrome_test_util::ShareButton()]
       performAction:grey_tap()];
 }
 
 @end