Remove unused code

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

Index: ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item.mm
diff --git a/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item.mm b/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item.mm
deleted file mode 100644
index 5323342071be41ea986a1ebc1fb06a6e9338dc2a..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item.mm
+++ /dev/null
@@ -1,97 +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.
-
-#import "ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item.h"
-
-#import "ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item_actions.h"
-#import "ios/third_party/material_components_ios/src/components/Palettes/src/MaterialPalettes.h"
-#import "ios/third_party/material_components_ios/src/components/Typography/src/MaterialTypography.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-@interface ContentSuggestionsButtonItem ()
-
-@property(nonatomic, copy) NSString* title;
-@property(nonatomic, copy) NSString* subtitle;
-
-@end
-
-@implementation ContentSuggestionsButtonItem
-
-@synthesize title = _title;
-@synthesize subtitle = _subtitle;
-
-- (instancetype)initWithType:(NSInteger)type
-                       title:(NSString*)title
-                    subtitle:(NSString*)subtitle {
-  self = [super initWithType:type];
-  if (self) {
-    self.cellClass = [ContentSuggestionsButtonCell class];
-    _title = [title copy];
-    _subtitle = [subtitle copy];
-  }
-  return self;
-}
-
-#pragma mark - CollectionViewItem
-
-- (void)configureCell:(ContentSuggestionsButtonCell*)cell {
-  [super configureCell:cell];
-  [cell.titleButton setTitle:self.title forState:UIControlStateNormal];
-  cell.detailTextLabel.text = self.subtitle;
-}
-
-@end
-
-#pragma mark - ContentSuggestionsButtonCell
-
-@implementation ContentSuggestionsButtonCell
-
-@synthesize titleButton = _titleButton;
-@synthesize detailTextLabel = _detailTextLabel;
-
-- (instancetype)initWithFrame:(CGRect)frame {
-  self = [super initWithFrame:frame];
-  if (self) {
-    id<MDCTypographyFontLoading> fontLoader = [MDCTypography fontLoader];
-    _titleButton = [UIButton buttonWithType:UIButtonTypeSystem];
-    _titleButton.titleLabel.font = [fontLoader mediumFontOfSize:16];
-    _titleButton.titleLabel.textColor = [[MDCPalette greyPalette] tint900];
-    [_titleButton addTarget:nil
-                     action:@selector(addNewTextItem:)
-           forControlEvents:UIControlEventTouchUpInside];
-
-    _detailTextLabel = [[UILabel alloc] init];
-    _detailTextLabel.font = [fontLoader mediumFontOfSize:14];
-    _detailTextLabel.textColor = [[MDCPalette greyPalette] tint500];
-
-    UIStackView* labelsStack = [[UIStackView alloc]
-        initWithArrangedSubviews:@[ _titleButton, _detailTextLabel ]];
-    labelsStack.axis = UILayoutConstraintAxisVertical;
-
-    [self.contentView addSubview:labelsStack];
-    labelsStack.layoutMarginsRelativeArrangement = YES;
-    labelsStack.layoutMargins = UIEdgeInsetsMake(16, 16, 16, 16);
-    labelsStack.alignment = UIStackViewAlignmentCenter;
-
-    labelsStack.translatesAutoresizingMaskIntoConstraints = NO;
-    [NSLayoutConstraint activateConstraints:@[
-      [self.contentView.leadingAnchor
-          constraintEqualToAnchor:labelsStack.leadingAnchor],
-      [self.contentView.trailingAnchor
-          constraintEqualToAnchor:labelsStack.trailingAnchor],
-      [self.contentView.topAnchor
-          constraintEqualToAnchor:labelsStack.topAnchor],
-      [self.contentView.bottomAnchor
-          constraintEqualToAnchor:labelsStack.bottomAnchor]
-    ]];
-
-    self.backgroundColor = [UIColor whiteColor];
-  }
-  return self;
-}
-
-@end