Add header for the Content Suggestions

ios/chrome/browser/ui/content_suggestions/content_suggestions_footer_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_FOOTER_ITEM_H_
 #define IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_FOOTER_ITEM_H_
 
 #import "base/ios/block_types.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
-#import "ios/chrome/browser/ui/content_suggestions/content_suggestion_identifier.h"
 #import "ios/third_party/material_components_ios/src/components/CollectionCells/src/MaterialCollectionCells.h"
 
 // Item for a footer of a Content Suggestions section.
-@interface ContentSuggestionsFooterItem
-    : CollectionViewItem<ContentSuggestionIdentification>
+@interface ContentSuggestionsFooterItem : CollectionViewItem
 
 // Initialize a footer with a button taking all the space, with a |title| and a
 // |block| run when tapped.
 - (instancetype)initWithType:(NSInteger)type
                        title:(NSString*)title
                        block:(ProceduralBlock)block NS_DESIGNATED_INITIALIZER;
 
 - (instancetype)initWithType:(NSInteger)type NS_UNAVAILABLE;
 
 @end
 
 // Corresponding cell for a Content Suggestions' section footer.
 @interface ContentSuggestionsFooterCell : MDCCollectionViewCell
 
 @property(nonatomic, readonly, strong) UIButton* button;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_FOOTER_ITEM_H_