Remove ContextMenuController.

ios/chrome/browser/ui/context_menu/context_menu_controller.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 "ios/chrome/browser/ui/context_menu/context_menu_controller.h"
-
-#include <algorithm>
-
-#include "base/ios/weak_nsobject.h"
-#include "base/logging.h"
-#import "base/mac/scoped_nsobject.h"
-#import "ios/chrome/browser/ui/context_menu/context_menu_holder.h"
-#include "ui/base/device_form_factor.h"
-#include "ui/base/l10n/l10n_util.h"
-#include "ui/strings/grit/ui_strings.h"
-
-@interface ContextMenuController () {
-  // Underlying system alert.
-  base::WeakNSObject<UIAlertController> _alert;
-}
-// Redefined to readwrite.
-@property(nonatomic, readwrite, getter=isVisible) BOOL visible;
-@end
-
-@implementation ContextMenuController
-@synthesize visible = _visible;
-
-- (void)dealloc {
-  [_alert dismissViewControllerAnimated:NO completion:nil];
-  [super dealloc];
-}
-
-- (void)showWithHolder:(ContextMenuHolder*)menuHolder
-               atPoint:(CGPoint)point
-                inView:(UIView*)view {
-  DCHECK(menuHolder.itemCount);
-  // Check that the view is still visible on screen, otherwise just return and
-  // don't show the context menu.
-  if (![view window] && ![view isKindOfClass:[UIWindow class]])
-    return;
-
-  UIAlertController* alert = [UIAlertController
-      alertControllerWithTitle:menuHolder.menuTitle
-                       message:nil
-                preferredStyle:UIAlertControllerStyleActionSheet];
-  alert.popoverPresentationController.sourceView = view;
-  alert.popoverPresentationController.sourceRect =
-      CGRectMake(point.x, point.y, 1.0, 1.0);
-
-  // Add the actions.
-  base::WeakNSObject<ContextMenuController> weakSelf(self);
-  [menuHolder.itemTitles enumerateObjectsUsingBlock:^(
-                             NSString* itemTitle, NSUInteger itemIndex, BOOL*) {
-    void (^actionHandler)(UIAlertAction*) = ^(UIAlertAction* action) {
-      [menuHolder performActionAtIndex:itemIndex];
-      [weakSelf setVisible:NO];
-    };
-    [alert addAction:[UIAlertAction actionWithTitle:itemTitle
-                                              style:UIAlertActionStyleDefault
-                                            handler:actionHandler]];
-  }];
-
-  // Cancel button goes last, to match other browsers.
-  void (^cancelHandler)(UIAlertAction*) = ^(UIAlertAction* action) {
-    [weakSelf setVisible:NO];
-  };
-  UIAlertAction* cancel_action =
-      [UIAlertAction actionWithTitle:l10n_util::GetNSString(IDS_APP_CANCEL)
-                               style:UIAlertActionStyleCancel
-                             handler:cancelHandler];
-  [alert addAction:cancel_action];
-
-  // Present sheet/popover using controller that is added to view hierarchy.
-  UIViewController* topController = view.window.rootViewController;
-  while (topController.presentedViewController)
-    topController = topController.presentedViewController;
-  [topController presentViewController:alert animated:YES completion:nil];
-  self.visible = YES;
-  _alert.reset(alert);
-}
-
-- (void)dismissAnimated:(BOOL)animated
-      completionHandler:(ProceduralBlock)completionHandler {
-  [_alert dismissViewControllerAnimated:animated completion:completionHandler];
-}
-
-@end