[ObjC ARC] Converts ios/chrome/browser/ui/ntp:ntp_internal to ARC.

ios/chrome/browser/ui/ntp/most_visited_cell.mm

 // 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/ntp/most_visited_cell.h"
 
 #include <memory>
 
-#import "base/ios/weak_nsobject.h"
 #include "base/mac/bind_objc_block.h"
-#import "base/mac/scoped_nsobject.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/favicon/core/fallback_url_util.h"
 #import "ios/chrome/browser/ui/ntp/google_landing_data_source.h"
 #import "ios/chrome/browser/ui/uikit_ui_util.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
+
 const CGFloat kFaviconSize = 48;
 const CGFloat kImageViewBackgroundColor = 0.941;
 const CGFloat kImageViewCornerRadius = 3;
 const NSInteger kLabelNumLines = 2;
 const CGFloat kLabelTextColor = 0.314;
 const CGFloat kMaximumWidth = 73;
 const CGFloat kMaximumHeight = 100;
 
 @interface MostVisitedCell () {
   // Backs property with the same name.
   GURL _URL;
   // Weak reference to the relevant GoogleLandingDataSource.
-  base::WeakNSProtocol<id<GoogleLandingDataSource>> _dataSource;
+  __weak id<GoogleLandingDataSource> _dataSource;
   // Backs property with the same name.
   ntp_tiles::TileVisualType _tileType;
 
-  base::scoped_nsobject<UILabel> _label;
-  base::scoped_nsobject<UILabel> _noIconLabel;
-  base::scoped_nsobject<UIImageView> _imageView;
+  UILabel* _label;
+  UILabel* _noIconLabel;
+  UIImageView* _imageView;
 }
 // Set the background color and center the first letter of the site title (or
 // domain if the title is a url).
 - (void)updateIconLabelWithColor:(UIColor*)textColor
                  backgroundColor:(UIColor*)backgroundColor
         isDefaultBackgroundColor:(BOOL)isDefaultBackgroundColor;
 // Set icon of top site.
 - (void)setImage:(UIImage*)image;
 @end
 
 @implementation MostVisitedCell
 
 @synthesize URL = _URL;
 @synthesize tileType = _tileType;
 
 - (instancetype)initWithFrame:(CGRect)frame {
   self = [super initWithFrame:frame];
   if (!self) {
     return nil;
   }
-  _label.reset([[UILabel alloc] initWithFrame:CGRectZero]);
+  _label = [[UILabel alloc] initWithFrame:CGRectZero];
   [_label setTextColor:[UIColor colorWithWhite:kLabelTextColor alpha:1.0]];
   [_label setBackgroundColor:[UIColor clearColor]];
   [_label setFont:[MDCTypography captionFont]];
   [_label setTextAlignment:NSTextAlignmentCenter];
   CGSize maxSize = [self.class maximumSize];
   [_label setPreferredMaxLayoutWidth:maxSize.width];
   [_label setNumberOfLines:kLabelNumLines];
 
-  _noIconLabel.reset([[UILabel alloc] initWithFrame:CGRectZero]);
+  _noIconLabel = [[UILabel alloc] initWithFrame:CGRectZero];
   [_noIconLabel setBackgroundColor:[UIColor clearColor]];
   [_noIconLabel setFont:[MDCTypography headlineFont]];
   [_noIconLabel setTextAlignment:NSTextAlignmentCenter];
 
-  _imageView.reset([[UIImageView alloc] initWithFrame:CGRectZero]);
+  _imageView = [[UIImageView alloc] initWithFrame:CGRectZero];
   [_imageView layer].cornerRadius = kImageViewCornerRadius;
   [_imageView setClipsToBounds:YES];
   [self addSubview:_imageView];
   [self addSubview:_label];
   [self addSubview:_noIconLabel];
 
   [_noIconLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
   [_imageView setTranslatesAutoresizingMaskIntoConstraints:NO];
   [_label setTranslatesAutoresizingMaskIntoConstraints:NO];
 
@@ skipping 40 matching lines @@
   [self setUserInteractionEnabled:YES];
 }
 
 - (void)showPlaceholder {
   [_imageView setBackgroundColor:[[MDCPalette greyPalette] tint50]];
 }
 
 - (void)setupWithURL:(GURL)URL
                title:(NSString*)title
           dataSource:(id<GoogleLandingDataSource>)dataSource {
-  _dataSource.reset(dataSource);
+  _dataSource = dataSource;
   _tileType = ntp_tiles::TileVisualType::NONE;
   [self setText:title];
   [self setURL:URL];
-  base::WeakNSObject<MostVisitedCell> weakSelf(self);
+  __weak MostVisitedCell* weakSelf = self;
 
   void (^faviconImageBlock)(UIImage*) = ^(UIImage* favicon) {
 
     if (URL == [weakSelf URL])  // Tile has not been reused.
       [weakSelf setImage:favicon];
   };
 
   void (^faviconFallbackBlock)(UIColor*, UIColor*, BOOL) =
       ^(UIColor* textColor, UIColor* backgroundColor, BOOL isDefaultColor) {
         if (URL == [weakSelf URL])  // Tile has not been reused.
@@ skipping 35 matching lines @@
 }
 
 - (void)setImage:(UIImage*)image {
   [_imageView setBackgroundColor:nil];
   [_noIconLabel setText:nil];
   [_imageView setImage:image];
   _tileType = ntp_tiles::TileVisualType::ICON_REAL;
 }
 
 @end