Limit the number of Most Visited lines to two

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 106 matching lines @@
   self.styler.cellStyle = MDCCollectionViewCellStyleCard;
 
   UILongPressGestureRecognizer* longPressRecognizer =
       [[UILongPressGestureRecognizer alloc]
           initWithTarget:self
                   action:@selector(handleLongPress:)];
   longPressRecognizer.numberOfTouchesRequired = 1;
   [self.collectionView addGestureRecognizer:longPressRecognizer];
 }
 
+- (void)viewWillTransitionToSize:(CGSize)size
+       withTransitionCoordinator:
+           (id<UIViewControllerTransitionCoordinator>)coordinator {
+  [self.collectionUpdater updateMostVisitedForSize:size];
+}
+
 #pragma mark - UICollectionViewDelegate
 
 - (void)collectionView:(UICollectionView*)collectionView
     didSelectItemAtIndexPath:(NSIndexPath*)indexPath {
   [super collectionView:collectionView didSelectItemAtIndexPath:indexPath];
 
   CollectionViewItem* item =
       [self.collectionViewModel itemAtIndexPath:indexPath];
   switch ([self.collectionUpdater contentSuggestionTypeForItem:item]) {
     case ContentSuggestionTypeReadingList:
@@ skipping 122 matching lines @@
 - (void)addEmptySectionPlaceholderIfNeeded:(NSInteger)section {
   if ([self.collectionViewModel numberOfItemsInSection:section] > 0)
     return;
 
   NSIndexPath* emptyItem =
       [self.collectionUpdater addEmptyItemForSection:section];
   [self.collectionView insertItemsAtIndexPaths:@[ emptyItem ]];
 }
 
 @end