[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 "base/task/cancelable_task_tracker.h"
 #include "components/favicon/core/fallback_url_util.h"
 #include "components/favicon/core/large_icon_service.h"
 #include "components/favicon_base/fallback_icon_style.h"
 #include "components/favicon_base/favicon_types.h"
 #include "components/history/core/browser/top_sites.h"
 #include "components/suggestions/suggestions_service.h"
 #import "ios/chrome/browser/favicon/favicon_loader.h"
 #include "ios/chrome/browser/favicon/favicon_service_factory.h"
 #include "ios/chrome/browser/favicon/large_icon_cache.h"
 #include "ios/chrome/browser/history/top_sites_factory.h"
 #include "ios/chrome/browser/suggestions/suggestions_service_factory.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"
 #include "skia/ext/skia_utils_ios.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 const CGFloat kFaviconSize = 48;
 const CGFloat kFaviconMinSize = 32;
 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;
   // Used to cancel tasks for the LargeIconService.
   base::CancelableTaskTracker _cancelable_task_tracker;
 }
 // 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 (^faviconBlock)(const favicon_base::LargeIconResult&) =
       ^(const favicon_base::LargeIconResult& result) {
-        base::scoped_nsobject<MostVisitedCell> strongSelf([weakSelf retain]);
+        MostVisitedCell* strongSelf = weakSelf;
         if (!strongSelf)
           return;
 
         if (URL == [strongSelf URL]) {  // Tile has not been reused.
           if (result.bitmap.is_valid()) {
             scoped_refptr<base::RefCountedMemory> data =
                 result.bitmap.bitmap_data.get();
             UIImage* favicon =
                 [UIImage imageWithData:[NSData dataWithBytes:data->front()
                                                       length:data->size()]
                                  scale:[UIScreen mainScreen].scale];
             [strongSelf setImage:favicon];
           } else if (result.fallback_icon_style) {
             UIColor* backgroundColor = skia::UIColorFromSkColor(
                 result.fallback_icon_style->background_color);
             UIColor* textColor = skia::UIColorFromSkColor(
                 result.fallback_icon_style->text_color);
             [strongSelf updateIconLabelWithColor:textColor
                                  backgroundColor:backgroundColor
                         isDefaultBackgroundColor:result.fallback_icon_style->
                                                  is_default_background_color];
           }
         }
 
         if (result.bitmap.is_valid() || result.fallback_icon_style) {
           LargeIconCache* largeIconCache =
-              [strongSelf.get()->_dataSource largeIconCache];
+              [strongSelf->_dataSource largeIconCache];
           if (largeIconCache)
             largeIconCache->SetCachedResult(URL, result);
         }
       };
 
   LargeIconCache* cache = [_dataSource largeIconCache];
   std::unique_ptr<favicon_base::LargeIconResult> cached_result =
       cache->GetCachedResult(URL);
   if (cached_result) {
     faviconBlock(*cached_result);
   }
 
   // Always call LargeIconService in case the favicon was updated.
   favicon::LargeIconService* large_icon_service =
       [_dataSource largeIconService];
   CGFloat faviconSize = [UIScreen mainScreen].scale * kFaviconSize;
   CGFloat faviconMinSize = [UIScreen mainScreen].scale * kFaviconMinSize;
   large_icon_service->GetLargeIconOrFallbackStyle(
-      URL, faviconMinSize, faviconSize, base::BindBlock(faviconBlock),
+      URL, faviconMinSize, faviconSize, base::BindBlockArc(faviconBlock),
       &_cancelable_task_tracker);
 }
 
 - (void)removePlaceholderImage {
   [_imageView setBackgroundColor:nil];
   [self setUserInteractionEnabled:NO];
 }
 
 #pragma mark - Class methods
 
@@ skipping 16 matching lines @@
 }
 
 - (void)setImage:(UIImage*)image {
   [_imageView setBackgroundColor:nil];
   [_noIconLabel setText:nil];
   [_imageView setImage:image];
   _tileType = ntp_tiles::TileVisualType::ICON_REAL;
 }
 
 @end