[ObjC ARC] Reland of Converts ios/chrome/browser/ui:ui to ARC.

ios/chrome/browser/ui/favicon_view.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/favicon_view.h"
 
-#include "base/mac/objc_property_releaser.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 {
 // Default corner radius for the favicon image view.
 const CGFloat kDefaultCornerRadius = 3;
 }
 
 @interface FaviconViewNew () {
   // Property releaser for FaviconViewNew.
-  base::mac::ObjCPropertyReleaser _propertyReleaser_FaviconViewNew;
 }
 
 // Image view for the favicon.
-@property(nonatomic, retain) UIImageView* faviconImageView;
+@property(nonatomic, strong) UIImageView* faviconImageView;
 // Label for fallback favicon placeholder.
-@property(nonatomic, retain) UILabel* faviconFallbackLabel;
+@property(nonatomic, strong) UILabel* faviconFallbackLabel;
 
 @end
 
 @implementation FaviconViewNew
 @synthesize faviconImageView = _faviconImageView;
 @synthesize faviconFallbackLabel = _faviconFallbackLabel;
 
 - (instancetype)initWithFrame:(CGRect)frame {
   self = [super initWithFrame:frame];
   if (self) {
-    _propertyReleaser_FaviconViewNew.Init(self, [FaviconViewNew class]);
     _faviconImageView = [[UIImageView alloc] initWithFrame:self.bounds];
     _faviconImageView.clipsToBounds = YES;
     _faviconImageView.layer.cornerRadius = kDefaultCornerRadius;
     _faviconImageView.image = nil;
 
     _faviconFallbackLabel = [[UILabel alloc] initWithFrame:self.bounds];
     _faviconFallbackLabel.backgroundColor = [UIColor clearColor];
     _faviconFallbackLabel.textAlignment = NSTextAlignmentCenter;
     _faviconFallbackLabel.isAccessibilityElement = NO;
     _faviconFallbackLabel.clipsToBounds = YES;
@@ skipping 33 matching lines @@
   self.faviconFallbackLabel.font = font;
 }
 
 #pragma mark - UIView
 
 - (CGSize)intrinsicContentSize {
   return CGSizeMake(kFaviconPreferredSize, kFaviconPreferredSize);
 }
 
 @end