Cleanup ContentSuggestions cells

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

-// Copyright 2017 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_EXPANDABLE_ITEM_H_
-#define IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_EXPANDABLE_ITEM_H_
-
-#import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
-#import "ios/chrome/browser/ui/content_suggestions/expandable_item.h"
-#import "ios/third_party/material_components_ios/src/components/CollectionCells/src/MaterialCollectionCells.h"
-
-@class ContentSuggestionsExpandableCell;
-
-// Delegate for the ContentSuggestionsExpandableCell. The delegate will take
-// care of the expansion/collapsing of the cell.
-@protocol ContentSuggestionsExpandableCellDelegate
-
-- (void)expandCell:(UICollectionViewCell*)cell;
-- (void)collapseCell:(UICollectionViewCell*)cell;
-
-@end
-
-// Item for an expandable article in the suggestions. An expandable article can
-// be expanded, displaying more informations/interactions.
-@interface SuggestionsExpandableItem : CollectionViewItem<ExpandableItem>
-
-// Init the article with a |title|, a |subtitle| an |image| and some |detail|
-// displayed only when the article is expanded. |type| is the type of the item.
-- (instancetype)initWithType:(NSInteger)type
-                       title:(NSString*)title
-                    subtitle:(NSString*)subtitle
-                       image:(UIImage*)image
-                  detailText:(NSString*)detail NS_DESIGNATED_INITIALIZER;
-
-- (instancetype)initWithType:(NSInteger)type NS_UNAVAILABLE;
-
-// Delegate for the configured cells.
-@property(nonatomic, weak) id<ContentSuggestionsExpandableCellDelegate>
-    delegate;
-
-@end
-
-// Corresponding cell of an expandable article.
-@interface ContentSuggestionsExpandableCell : MDCCollectionViewCell
-
-@property(nonatomic, weak) id<ContentSuggestionsExpandableCellDelegate>
-    delegate;
-@property(nonatomic, readonly, strong) UILabel* titleLabel;
-@property(nonatomic, readonly, strong) UILabel* subtitleLabel;
-@property(nonatomic, readonly, strong) UILabel* detailLabel;
-@property(nonatomic, strong) UIImageView* imageView;
-
-- (void)expand;
-- (void)collapse;
-
-@end
-
-#endif  // IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_EXPANDABLE_ITEM_H_