Remove unused code

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

Index: ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_stack_item.mm
diff --git a/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_stack_item.mm b/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_stack_item.mm
deleted file mode 100644
index c36d9530d16d79f48be54e5bf887a8dc853189da..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_stack_item.mm
+++ /dev/null
@@ -1,143 +0,0 @@
-// 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.
-
-#import "ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_stack_item.h"
-
-#import "ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_stack_item_actions.h"
-#import "ios/chrome/browser/ui/uikit_ui_util.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-namespace {
-const CGFloat kStackSpacing = 8;
-}
-
-@implementation ContentSuggestionsStackItem {
-  NSString* _title;
-  NSString* _subtitle;
-}
-
-- (instancetype)initWithType:(NSInteger)type
-                       title:(NSString*)title
-                    subtitle:(NSString*)subtitle {
-  self = [super initWithType:type];
-  if (self) {
-    self.cellClass = [ContentSuggestionsStackCell class];
-    _title = [title copy];
-    _subtitle = [subtitle copy];
-  }
-  return self;
-}
-
-#pragma mark - CollectionViewItem
-
-- (void)configureCell:(ContentSuggestionsStackCell*)cell {
-  [super configureCell:cell];
-  [cell.titleButton setTitle:_title forState:UIControlStateNormal];
-  cell.detailTextLabel.text = _subtitle;
-}
-
-@end
-
-@implementation ContentSuggestionsStackCell
-
-@synthesize titleButton = _titleButton;
-@synthesize detailTextLabel = _detailTextLabel;
-
-- (instancetype)initWithFrame:(CGRect)frame {
-  self = [super initWithFrame:frame];
-  if (self) {
-    self.backgroundColor = [UIColor clearColor];
-    self.contentView.backgroundColor = [UIColor clearColor];
-    self.backgroundView.backgroundColor = [UIColor clearColor];
-
-    UIControl* itemDisplay = [[UIControl alloc] init];
-    itemDisplay.layer.borderColor = [UIColor blackColor].CGColor;
-    itemDisplay.layer.borderWidth = 1;
-    itemDisplay.backgroundColor = [UIColor whiteColor];
-    [itemDisplay addTarget:nil
-                    action:@selector(openReadingListFirstItem:)
-          forControlEvents:UIControlEventTouchUpInside];
-    itemDisplay.translatesAutoresizingMaskIntoConstraints = NO;
-
-    _titleButton = [UIButton buttonWithType:UIButtonTypeSystem];
-    _detailTextLabel = [[UILabel alloc] init];
-    _titleButton.translatesAutoresizingMaskIntoConstraints = NO;
-    _detailTextLabel.translatesAutoresizingMaskIntoConstraints = NO;
-
-    [itemDisplay addSubview:_titleButton];
-    [itemDisplay addSubview:_detailTextLabel];
-
-    // Placeholder. This view is only used to display a border below the item.
-    UIView* secondView = [[UIView alloc] init];
-    secondView.backgroundColor = [UIColor whiteColor];
-    secondView.translatesAutoresizingMaskIntoConstraints = NO;
-    secondView.layer.borderColor = [UIColor blackColor].CGColor;
-    secondView.layer.borderWidth = 1;
-
-    // Placeholder. This view is only used to display a border below the item.
-    UIView* thirdView = [[UIView alloc] init];
-    thirdView.backgroundColor = [UIColor whiteColor];
-    thirdView.translatesAutoresizingMaskIntoConstraints = NO;
-    thirdView.layer.borderColor = [UIColor blackColor].CGColor;
-    thirdView.layer.borderWidth = 1;
-
-    // Placeholder. This view is only used to display a border below the item.
-    UIView* fourthView = [[UIView alloc] init];
-    fourthView.backgroundColor = [UIColor whiteColor];
-    fourthView.translatesAutoresizingMaskIntoConstraints = NO;
-    fourthView.layer.borderColor = [UIColor blackColor].CGColor;
-    fourthView.layer.borderWidth = 1;
-
-    [self.contentView addSubview:itemDisplay];
-    [self.contentView insertSubview:secondView belowSubview:itemDisplay];
-    [self.contentView insertSubview:thirdView belowSubview:secondView];
-    [self.contentView insertSubview:fourthView belowSubview:thirdView];
-
-    [NSLayoutConstraint activateConstraints:@[
-      [itemDisplay.widthAnchor constraintEqualToAnchor:secondView.widthAnchor],
-      [itemDisplay.heightAnchor
-          constraintEqualToAnchor:secondView.heightAnchor],
-      [itemDisplay.widthAnchor constraintEqualToAnchor:thirdView.widthAnchor],
-      [itemDisplay.heightAnchor constraintEqualToAnchor:thirdView.heightAnchor],
-      [itemDisplay.widthAnchor constraintEqualToAnchor:fourthView.widthAnchor],
-      [itemDisplay.heightAnchor
-          constraintEqualToAnchor:fourthView.heightAnchor],
-    ]];
-
-    ApplyVisualConstraintsWithMetrics(
-        @[
-          @"H:|-[title]-|",
-          @"H:|-[text]-|",
-          @"H:|[item]-(fourSpace)-|",
-          @"H:|-(oneSpace)-[second]-(threeSpace)-|",
-          @"H:|-(twoSpace)-[third]-(twoSpace)-|",
-          @"H:|-(threeSpace)-[fourth]-(oneSpace)-|",
-          @"V:|-[title]-[text]-|",
-          @"V:|[item]",
-          @"V:|-(oneSpace)-[second]",
-          @"V:|-(twoSpace)-[third]",
-          @"V:|-(threeSpace)-[fourth]|",
-        ],
-        @{
-          @"title" : _titleButton,
-          @"text" : _detailTextLabel,
-          @"item" : itemDisplay,
-          @"second" : secondView,
-          @"third" : thirdView,
-          @"fourth" : fourthView,
-        },
-        @{
-          @"oneSpace" : @(kStackSpacing * 1),
-          @"twoSpace" : @(kStackSpacing * 2),
-          @"threeSpace" : @(kStackSpacing * 3),
-          @"fourSpace" : @(kStackSpacing * 4)
-        });
-  }
-  return self;
-}
-
-@end