Remove suggestions notified as invalid

ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.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/browser/ui/content_suggestions/content_suggestions_view_controller.h"
 
 #include "base/mac/foundation_util.h"
 #import "ios/chrome/browser/ui/collection_view/cells/MDCCollectionViewCell+Chrome.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
@@ skipping 22 matching lines @@
 // Expand or collapse the |cell|, if it is a ContentSuggestionsExpandableCell,
 // according to |expand|.
 - (void)expand:(BOOL)expand cell:(UICollectionViewCell*)cell;
 
 @end
 
 @implementation ContentSuggestionsViewController
 
 @synthesize suggestionCommandHandler = _suggestionCommandHandler;
 @synthesize collectionUpdater = _collectionUpdater;
+@dynamic collectionViewModel;
 
 #pragma mark - Public
 
 - (instancetype)initWithStyle:(CollectionViewControllerStyle)style
                    dataSource:(id<ContentSuggestionsDataSource>)dataSource {
   self = [super initWithStyle:style];
   if (self) {
     _collectionUpdater = [[ContentSuggestionsCollectionUpdater alloc]
         initWithDataSource:dataSource];
   }
   return self;
 }
 
 - (void)dismissEntryAtIndexPath:(NSIndexPath*)indexPath {
   if (!indexPath || ![self.collectionViewModel hasItemAtIndexPath:indexPath]) {
     return;
   }
 
   [self.collectionView performBatchUpdates:^{
     [self collectionView:self.collectionView
         willDeleteItemsAtIndexPaths:@[ indexPath ]];
 
     [self.collectionView deleteItemsAtIndexPaths:@[ indexPath ]];
   }
-                                completion:nil];
+      completion:^(BOOL) {
+        // The context menu could be displayed for the delete entry.
+        [self.suggestionCommandHandler dismissContextMenu];
+      }];
 }
 
 #pragma mark - UIViewController
 
 - (void)viewDidLoad {
   [super viewDidLoad];
 
   _collectionUpdater.collectionViewController = self;
 
   self.collectionView.delegate = self;
@@ skipping 135 matching lines @@
   ContentSuggestionsArticleItem* articleItem =
       base::mac::ObjCCastStrict<ContentSuggestionsArticleItem>(touchedItem);
 
   [self.suggestionCommandHandler
       displayContextMenuForArticle:articleItem
                            atPoint:touchLocation
                        atIndexPath:touchedItemIndexPath];
 }
 
 @end