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

ios/chrome/browser/ui/page_not_available_controller.mm

 // Copyright 2012 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/page_not_available_controller.h"
 
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
-#include "base/mac/objc_property_releaser.h"
-#include "base/mac/scoped_nsobject.h"
+
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/strings/grit/components_strings.h"
 #include "components/url_formatter/url_formatter.h"
 #include "ui/base/l10n/l10n_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 {
 // Top padding for |self.titleLabel|.
 const CGFloat kTitleLabelTopPadding = 20.0;
 // Height for |self.titleLabel|.
 const CGFloat kTitleLabelHeight = 38.0;
 // Top padding for |self.descriptionView|.
 const CGFloat kDescriptionViewTopPadding = 66.0;
 // Bottom padding for |self.descriptionView|.
 const CGFloat kDescriptionViewBottomPadding = 20.0;
 // Horizontal padding between subviews and |self.view|.
 const CGFloat kHorizontalPadding = 20.0;
 // Font size for |self.titleLabel|.
 const CGFloat kTitleLabelFontSize = 18.0;
 // Font size for |self.descriptionView|.
 const CGFloat kDescriptionViewFontSize = 17.0;
 }
 
 @interface PageNotAvailableController () {
-  base::mac::ObjCPropertyReleaser _propertyReleaser_PageNotAvailableController;
 }
 
 // The title label displayed centered at the top of the screen.
-@property(nonatomic, retain) UILabel* titleLabel;
+@property(nonatomic, strong) UILabel* titleLabel;
 
 // TextView containing a detailed description of the problem.
-@property(nonatomic, retain) UITextView* descriptionView;
+@property(nonatomic, strong) UITextView* descriptionView;
 
 @end
 
 @implementation PageNotAvailableController
 
 @synthesize titleLabel = _titleLabel;
 @synthesize descriptionView = _descriptionView;
 @synthesize descriptionText = _descriptionText;
 
 - (instancetype)initWithUrl:(const GURL&)url {
   self = [super initWithNibName:nil url:url];
   if (self) {
-    _propertyReleaser_PageNotAvailableController.Init(
-        self, [PageNotAvailableController class]);
-
     // Use the host as the page title, unless the URL has a custom scheme.
     if (self.url.SchemeIsHTTPOrHTTPS()) {
       self.title = base::SysUTF16ToNSString(
           url_formatter::IDNToUnicode(self.url.host()));
     } else {
       base::string16 formattedURL = url_formatter::FormatUrl(
           self.url, url_formatter::kFormatUrlOmitNothing,
           net::UnescapeRule::NORMAL, nullptr, nullptr, nullptr);
       if (base::i18n::IsRTL()) {
         base::i18n::WrapStringWithLTRFormatting(&formattedURL);
       }
       self.title = base::SysUTF16ToNSString(formattedURL);
     }
 
     // |self.view| setup.
     CGRect windowBounds = [UIApplication sharedApplication].keyWindow.bounds;
-    base::scoped_nsobject<UIView> view(
-        [[UIView alloc] initWithFrame:windowBounds]);
+    UIView* view = [[UIView alloc] initWithFrame:windowBounds];
     [view setBackgroundColor:[UIColor whiteColor]];
     [view setAutoresizingMask:(UIViewAutoresizingFlexibleWidth |
                                UIViewAutoresizingFlexibleHeight)];
     self.view = view;
 
     // |self.titleLabel| setup.
     CGRect titleLabelFrame = windowBounds;
     titleLabelFrame.origin.x += kHorizontalPadding;
     titleLabelFrame.size.width -= 2.0 * kHorizontalPadding;
     titleLabelFrame.origin.y += kTitleLabelTopPadding;
@@ skipping 29 matching lines @@
   return self;
 }
 
 - (instancetype)initWithNibName:(NSString*)nibName
                             url:(const GURL&)url NS_UNAVAILABLE {
   NOTREACHED();
   return nil;
 }
 
 - (void)setDescriptionText:(NSString*)descriptionText {
-  _descriptionText = descriptionText;
-  _descriptionView.text = descriptionText;
+  _descriptionText = [descriptionText copy];
+  _descriptionView.text = _descriptionText;
 }
 
 @end