Limit the number of Most Visited lines to two

ios/chrome/browser/ui/content_suggestions/content_suggestions_collection_updater.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_COLLECTION_UPDATER_H_
 #define IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_COLLECTION_UPDATER_H_
 
 #import <UIKit/UIKit.h>
 
 @class CollectionViewItem;
@@ skipping 47 matching lines @@
     (NSArray<CollectionViewItem<SuggestedContent>*>*)suggestions
       withSectionInfo:(ContentSuggestionsSectionInformation*)sectionInfo;
 
 // Adds an empty item to this |section| and returns its index path. The updater
 // does not do any check about the number of elements in the section.
 - (NSIndexPath*)addEmptyItemForSection:(NSInteger)section;
 
 // Returns whether |section| contains the Most Visited tiles.
 - (BOOL)isMostVisitedSection:(NSInteger)section;
 
+// Updates the number of Most Visited tiles shown for the |size|.
+- (void)updateMostVisitedForSize:(CGSize)size;
+
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_COLLECTION_UPDATER_H_