Delete non-Chromium style custom GREYAction.

ios/chrome/test/earl_grey/chrome_actions.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_actions.h"
 
 #import "base/mac/foundation_util.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_switch_item.h"
 #import "ios/chrome/test/app/chrome_test_util.h"
 #import "ios/web/public/test/earl_grey/web_view_actions.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace chrome_test_util {
 
 id<GREYAction> LongPressElementForContextMenu(const std::string& element_id,
                                               bool triggers_context_menu) {
   return WebViewLongPressElementForContextMenu(
       chrome_test_util::GetCurrentWebState(), element_id,
       triggers_context_menu);
 }
 
-id<GREYAction> longPressElementForContextMenu(const std::string& element_id,
-                                              bool triggers_context_menu) {
-  return LongPressElementForContextMenu(element_id, triggers_context_menu);
-}
-
 id<GREYAction> TurnCollectionViewSwitchOn(BOOL on) {
   id<GREYMatcher> constraints = grey_not(grey_systemAlertViewShown());
   NSString* actionName =
       [NSString stringWithFormat:@"Turn collection view switch to %@ state",
                                  on ? @"ON" : @"OFF"];
   return [GREYActionBlock
       actionWithName:actionName
          constraints:constraints
         performBlock:^BOOL(id collectionViewCell,
                            __strong NSError** errorOrNil) {
           CollectionViewSwitchCell* switchCell =
               base::mac::ObjCCastStrict<CollectionViewSwitchCell>(
                   collectionViewCell);
           UISwitch* switchView = switchCell.switchView;
           if (switchView.on ^ on) {
             id<GREYAction> longPressAction = [GREYActions
                 actionForLongPressWithDuration:kGREYLongPressDefaultDuration];
             return [longPressAction perform:switchView error:errorOrNil];
           }
           return YES;
         }];
 }
 
 }  // namespace chrome_test_util