Use UIAlertController on iOS8 for Context Menu.

ui/base/ios/cru_context_menu_controller.h

 // Copyright 2012 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.
 #ifndef UI_BASE_IOS_CRU_CONTEXT_MENU_CONTROLLER_H_
 #define UI_BASE_IOS_CRU_CONTEXT_MENU_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 
 @class CRUContextMenuHolder;
 
 // Abstracts displaying context menus for all device form factors, given a
 // CRUContextMenuHolder with the title and action to associate to each menu
 // item. Will show a sheet on the phone and use a popover on a tablet.
-@interface CRUContextMenuController : NSObject<UIActionSheetDelegate,
-                                               UIPopoverControllerDelegate>
+@interface CRUContextMenuController : NSObject
+
+// Whether the context menu is visible.
+@property(nonatomic, readonly, getter=isVisible) BOOL visible;
+
 // Displays a context menu. If on a tablet, |localPoint| is the point in
 // |view|'s coordinates to show the popup. If a phone, |localPoint| is unused
 // since the display is a sheet, but |view| is still used to attach the sheet to
 // the given view.
 // The |menuHolder| that will be put in the menu.
 - (void)showWithHolder:(CRUContextMenuHolder*)menuHolder
                atPoint:(CGPoint)localPoint
                 inView:(UIView*)view;
 
-// Returns whether the context menu is visible.
-- (BOOL)isVisible;
-
-@end
-
-@interface CRUContextMenuController (UsedForTesting)
-@property (readonly) UIActionSheet* sheet;
 @end
 
 #endif  // UI_BASE_IOS_CRU_CONTEXT_MENU_CONTROLLER_H_