Use UIAlertController on iOS8 for Context Menu.

ui/base/ios/cru_context_menu_controller_unittest.mm

 // 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.
 
 #import "ui/base/ios/cru_context_menu_controller.h"
 
 #import <UIKit/UIKit.h>
 
 #include "base/mac/scoped_nsobject.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 23 matching lines @@
       [[CRUContextMenuHolder alloc] init]);
   BOOL clicked = NO;
   BOOL* clickedPtr = &clicked;
 
   [holder appendItemWithTitle:@"foo" action:^{ *clickedPtr = YES; }];
   [holder setMenuTitle:@"FooTitle"];
 
   [_menuController showWithHolder:holder atPoint:CGPointZero inView:_window];
 
   EXPECT_TRUE([_menuController isVisible]);
-
-  UIActionSheet* sheet = _menuController.get().sheet;
-  [sheet dismissWithClickedButtonIndex:0 animated:NO];
-  [_menuController actionSheet:sheet didDismissWithButtonIndex:0];
-
-  EXPECT_TRUE(clicked);
-  EXPECT_FALSE([_menuController isVisible]);
 }
 
 TEST_F(ContextMenuControllerTest, ShouldDismissImmediately) {
   base::scoped_nsobject<CRUContextMenuHolder> holder(
       [[CRUContextMenuHolder alloc] init]);
   [holder appendItemWithTitle:@"foo" action:^{}];
   [holder appendItemWithTitle:@"bar" action:^{} dismissImmediately:YES];
   [holder appendItemWithTitle:@"baz" action:^{} dismissImmediately:NO];
 
   EXPECT_FALSE([holder shouldDismissImmediatelyOnClickedAtIndex:0]);
   EXPECT_TRUE([holder shouldDismissImmediatelyOnClickedAtIndex:1]);
   EXPECT_FALSE([holder shouldDismissImmediatelyOnClickedAtIndex:2]);
 }
 
 }  // namespace