Remove unused code

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

Index: ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_expandable_item.mm
diff --git a/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_expandable_item.mm b/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_expandable_item.mm
deleted file mode 100644
index 2f11475d0cf4418c49489c8cc76e4c1caa59fab6..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_expandable_item.mm
+++ /dev/null
@@ -1,237 +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_expandable_item.h"
-
-#import "ios/chrome/browser/ui/uikit_ui_util.h"
-#include "ui/base/l10n/l10n_util_mac.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-namespace {
-const CGFloat kImageSize = 80;
-const CGFloat kStandardSpacing = 8;
-}
-
-#pragma mark - SuggestionsExpandableItem
-
-@implementation SuggestionsExpandableItem {
-  NSString* _title;
-  NSString* _subtitle;
-  UIImage* _image;
-  NSString* _detail;
-}
-
-@synthesize delegate = _delegate;
-@synthesize expanded = _expanded;
-
-- (instancetype)initWithType:(NSInteger)type
-                       title:(NSString*)title
-                    subtitle:(NSString*)subtitle
-                       image:(UIImage*)image
-                  detailText:(NSString*)detail {
-  self = [super initWithType:type];
-  if (self) {
-    self.cellClass = [ContentSuggestionsExpandableCell class];
-    _title = [title copy];
-    _subtitle = [subtitle copy];
-    _image = image;
-    _detail = [detail copy];
-  }
-  return self;
-}
-
-#pragma mark - CollectionViewItem
-
-- (void)configureCell:(ContentSuggestionsExpandableCell*)cell {
-  [super configureCell:cell];
-  cell.delegate = self.delegate;
-  cell.titleLabel.text = _title;
-  cell.subtitleLabel.text = _subtitle;
-  cell.imageView.image = _image;
-  cell.detailLabel.text = _detail;
-  if (self.expanded)
-    [cell expand];
-  else
-    [cell collapse];
-}
-
-@end
-
-#pragma mark - ContentSuggestionsExpandableCell
-
-@interface ContentSuggestionsExpandableCell () {
-  UIView* _articleContainer;
-  UIButton* _interactionButton;
-  UIButton* _expandButton;
-  BOOL _expanded;
-  NSArray<NSLayoutConstraint*>* _expandedConstraints;
-  NSArray<NSLayoutConstraint*>* _collapsedConstraints;
-}
-
-// Callback for the UI action showing the details.
-- (void)expand:(id)sender;
-// Callback for the UI action hiding the details.
-- (void)collapse:(id)sender;
-
-@end
-
-@implementation ContentSuggestionsExpandableCell
-
-@synthesize titleLabel = _titleLabel;
-@synthesize subtitleLabel = _subtitleLabel;
-@synthesize detailLabel = _detailLabel;
-@synthesize imageView = _imageView;
-@synthesize delegate = _delegate;
-
-- (instancetype)initWithFrame:(CGRect)frame {
-  self = [super initWithFrame:frame];
-  if (self) {
-    _expanded = NO;
-    _titleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
-    _subtitleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
-    _imageView = [[UIImageView alloc] initWithFrame:CGRectZero];
-    _articleContainer = [[UIView alloc] initWithFrame:CGRectZero];
-    _expandButton = [UIButton buttonWithType:UIButtonTypeSystem];
-    _detailLabel = [[UILabel alloc] initWithFrame:CGRectZero];
-    _interactionButton = [UIButton buttonWithType:UIButtonTypeSystem];
-
-    _subtitleLabel.numberOfLines = 0;
-    [_expandButton setTitle:@"See more" forState:UIControlStateNormal];
-    _detailLabel.numberOfLines = 0;
-    [_interactionButton setTitle:@"Less interaction"
-                        forState:UIControlStateNormal];
-
-    _imageView.translatesAutoresizingMaskIntoConstraints = NO;
-    _titleLabel.translatesAutoresizingMaskIntoConstraints = NO;
-    _subtitleLabel.translatesAutoresizingMaskIntoConstraints = NO;
-    _articleContainer.translatesAutoresizingMaskIntoConstraints = NO;
-    _expandButton.translatesAutoresizingMaskIntoConstraints = NO;
-    _detailLabel.translatesAutoresizingMaskIntoConstraints = NO;
-    _interactionButton.translatesAutoresizingMaskIntoConstraints = NO;
-
-    [_expandButton addTarget:self
-                      action:@selector(expand:)
-            forControlEvents:UIControlEventTouchUpInside];
-    [_interactionButton addTarget:self
-                           action:@selector(collapse:)
-                 forControlEvents:UIControlEventTouchUpInside];
-
-    [_articleContainer addSubview:_imageView];
-    [_articleContainer addSubview:_titleLabel];
-    [_articleContainer addSubview:_subtitleLabel];
-
-    [self.contentView addSubview:_articleContainer];
-    [self.contentView addSubview:_expandButton];
-
-    [NSLayoutConstraint activateConstraints:@[
-      [self.contentView.centerXAnchor
-          constraintEqualToAnchor:_expandButton.centerXAnchor],
-      [_expandButton.topAnchor
-          constraintEqualToAnchor:_articleContainer.bottomAnchor],
-      [_expandButton.bottomAnchor
-          constraintEqualToAnchor:self.contentView.bottomAnchor],
-      [_articleContainer.bottomAnchor
-          constraintGreaterThanOrEqualToAnchor:_imageView.bottomAnchor
-                                      constant:kStandardSpacing],
-      [_articleContainer.bottomAnchor
-          constraintGreaterThanOrEqualToAnchor:_subtitleLabel.bottomAnchor
-                                      constant:kStandardSpacing],
-    ]];
-
-    ApplyVisualConstraintsWithMetrics(
-        @[
-          @"H:|[container]|", @"H:|-[title]-[image(imageSize)]-|",
-          @"H:|-[text]-[image]", @"V:|-[image(imageSize)]",
-          @"V:|-[title]-[text]", @"V:|[container]"
-        ],
-        @{
-          @"image" : _imageView,
-          @"title" : _titleLabel,
-          @"text" : _subtitleLabel,
-          @"container" : _articleContainer
-        },
-        @{ @"imageSize" : @(kImageSize) });
-
-    _expandedConstraints = @[
-      [_detailLabel.topAnchor
-          constraintEqualToAnchor:_articleContainer.bottomAnchor],
-      [_detailLabel.bottomAnchor
-          constraintEqualToAnchor:_interactionButton.topAnchor],
-      [_interactionButton.bottomAnchor
-          constraintEqualToAnchor:self.contentView.bottomAnchor],
-      [_detailLabel.leadingAnchor
-          constraintEqualToAnchor:self.contentView.leadingAnchor],
-      [_detailLabel.trailingAnchor
-          constraintEqualToAnchor:self.contentView.trailingAnchor]
-    ];
-    _collapsedConstraints = @[
-      [self.contentView.centerXAnchor
-          constraintEqualToAnchor:_expandButton.centerXAnchor],
-      [_expandButton.topAnchor
-          constraintEqualToAnchor:_articleContainer.bottomAnchor],
-      [_expandButton.bottomAnchor
-          constraintEqualToAnchor:self.contentView.bottomAnchor]
-    ];
-  }
-  return self;
-}
-
-#pragma mark - Private
-
-- (void)expand:(id)sender {
-  [self.delegate expandCell:self];
-}
-
-- (void)collapse:(id)sender {
-  [self.delegate collapseCell:self];
-}
-
-- (void)expand {
-  if (_expanded)
-    return;
-  _expanded = YES;
-
-  [self.contentView addSubview:_detailLabel];
-  [self.contentView addSubview:_interactionButton];
-  [_expandButton removeFromSuperview];
-
-  [NSLayoutConstraint deactivateConstraints:_collapsedConstraints];
-  [NSLayoutConstraint activateConstraints:_expandedConstraints];
-}
-
-- (void)collapse {
-  if (!_expanded)
-    return;
-  _expanded = NO;
-
-  [_detailLabel removeFromSuperview];
-  [_interactionButton removeFromSuperview];
-  [self.contentView addSubview:_expandButton];
-
-  [NSLayoutConstraint deactivateConstraints:_expandedConstraints];
-  [NSLayoutConstraint activateConstraints:_collapsedConstraints];
-}
-
-#pragma mark - UIView
-
-// Implements -layoutSubviews as per instructions in documentation for
-// +[MDCCollectionViewCell cr_preferredHeightForWidth:forItem:].
-- (void)layoutSubviews {
-  [super layoutSubviews];
-
-  // Adjust the text label preferredMaxLayoutWidth when the parent's width
-  // changes, for instance on screen rotation.
-  CGFloat parentWidth = CGRectGetWidth(self.contentView.bounds);
-  _subtitleLabel.preferredMaxLayoutWidth = parentWidth - kImageSize - 3 * 8;
-  _detailLabel.preferredMaxLayoutWidth = parentWidth;
-
-  // Re-layout with the new preferred width to allow the label to adjust its
-  // height.
-  [super layoutSubviews];
-}
-
-@end