Remove unused code

ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item.h

Index: ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item.h
diff --git a/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item.h b/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item.h
deleted file mode 100644
index aa7b5720292456ac4359991bba22ea00af8fea54..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item.h
+++ /dev/null
@@ -1,31 +0,0 @@
-// 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_CELLS_CONTENT_SUGGESTIONS_BUTTON_ITEM_H_
-#define IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CELLS_CONTENT_SUGGESTIONS_BUTTON_ITEM_H_
-
-#import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
-#import "ios/third_party/material_components_ios/src/components/CollectionCells/src/MaterialCollectionCells.h"
-
-// Item for a suggestions item with a title button and subtitle.
-@interface ContentSuggestionsButtonItem : CollectionViewItem
-
-// Init a suggestions item with a |title| and a |subtitle|. |type| is the type
-// of the item.
-- (instancetype)initWithType:(NSInteger)type
-                       title:(NSString*)title
-                    subtitle:(NSString*)subtitle NS_DESIGNATED_INITIALIZER;
-- (instancetype)initWithType:(NSInteger)type NS_UNAVAILABLE;
-
-@end
-
-// Corresponding cell for the item.
-@interface ContentSuggestionsButtonCell : MDCCollectionViewCell
-
-@property(nonatomic, readonly, strong) UIButton* titleButton;
-@property(nonatomic, readonly, strong) UILabel* detailTextLabel;
-
-@end
-
-#endif  // IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CELLS_CONTENT_SUGGESTIONS_BUTTON_ITEM_H_