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

ios/chrome/browser/ui/contextual_search/contextual_search_promo_view.mm

 // Copyright 2014 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/contextual_search/contextual_search_promo_view.h"
 
-#include "base/ios/weak_nsobject.h"
-#import "base/mac/scoped_nsobject.h"
 #import "ios/chrome/browser/ui/colors/MDCPalette+CrAdditions.h"
 #import "ios/chrome/browser/ui/contextual_search/contextual_search_panel_view.h"
 #include "ios/chrome/browser/ui/uikit_ui_util.h"
 #import "ios/chrome/browser/ui/util/label_link_controller.h"
 #import "ios/chrome/common/material_timing.h"
 #include "ios/chrome/common/string_util.h"
 #include "ios/chrome/grit/ios_strings.h"
 #import "ios/third_party/material_components_ios/src/components/Buttons/src/MaterialButtons.h"
 #import "ios/third_party/material_roboto_font_loader_ios/src/src/MaterialRobotoFontLoader.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 const int kMargin = 16;
 const int kSpaceBelowText = 32;
 const int kButtonSeparator = 8;
 const int kButtonHeight = 36;
 const int kButtonMinWidth = 88;
 const int kDividerHeight = 1;
 
 const int kTextFontSize = 16;
 const int kButtonFontSize = 14;
 const CGFloat kTextColorGrayShade = 0.494;
 const int kLinkColorRGB = 0x5D9AFF;
 
 const CGFloat kLineSpace = 1.15;
 
 // Animation timings.
 const CGFloat kCloseDuration = ios::material::kDuration1;
 }
 
 @interface ContextualSearchPromoView ()
-@property(nonatomic, assign) id<ContextualSearchPromoViewDelegate> delegate;
+@property(nonatomic, weak) id<ContextualSearchPromoViewDelegate> delegate;
 @end
 
 @implementation ContextualSearchPromoView {
-  base::scoped_nsobject<LabelLinkController> _linkController;
-  base::scoped_nsobject<NSMutableArray> _constraints;
+  LabelLinkController* _linkController;
+  NSMutableArray* _constraints;
 }
 
 @synthesize disabled = _disabled;
 @synthesize delegate = _delegate;
 
 + (BOOL)requiresConstraintBasedLayout {
   return YES;
 }
 
 - (instancetype)initWithFrame:(CGRect)frame
                      delegate:(id<ContextualSearchPromoViewDelegate>)delegate {
   if (!(self = [super initWithFrame:frame]))
     return nil;
 
   self.delegate = delegate;
   self.backgroundColor = [UIColor colorWithWhite:0.93 alpha:1.0];
 
   // Temp array to accumulate constraints as views are created.
   NSMutableArray* constraints = [NSMutableArray array];
 
   // Initialize text label and its link controller.
-  UILabel* text = [[[UILabel alloc] initWithFrame:CGRectZero] autorelease];
-  base::WeakNSObject<ContextualSearchPromoView> weakSelf(self);
-  _linkController.reset([[LabelLinkController alloc]
+  UILabel* text = [[UILabel alloc] initWithFrame:CGRectZero];
+  __weak ContextualSearchPromoView* weakSelf = self;
+  _linkController = [[LabelLinkController alloc]
       initWithLabel:text
              action:^(const GURL& gurl) {
                [[weakSelf delegate] promoViewSettingsTapped];
-             }]);
+             }];
   [_linkController setLinkColor:UIColorFromRGB(kLinkColorRGB)];
 
   // Label is as wide as the content area of the view.
   [constraints addObject:[text.widthAnchor
                              constraintEqualToAnchor:self.layoutMarginsGuide
                                                          .widthAnchor]];
 
   // Parse out link location from the label text.
   NSString* textString =
       l10n_util::GetNSString(IDS_IOS_CONTEXTUAL_SEARCH_SHORT_DESCRIPTION);
   NSRange linkRange;
   textString = ParseStringWithLink(textString, &linkRange);
 
   // Build style attributes for the label.
   NSMutableParagraphStyle* paragraphStyle =
-      [[[NSMutableParagraphStyle alloc] init] autorelease];
+      [[NSMutableParagraphStyle alloc] init];
   [paragraphStyle setLineBreakMode:NSLineBreakByWordWrapping];
   [paragraphStyle setLineHeightMultiple:kLineSpace];
   NSDictionary* attributes = @{
     NSParagraphStyleAttributeName : paragraphStyle,
     NSFontAttributeName :
         [[MDFRobotoFontLoader sharedInstance] regularFontOfSize:kTextFontSize],
     NSForegroundColorAttributeName :
         [UIColor colorWithWhite:kTextColorGrayShade alpha:1]
   };
 
   // Create and assign attributed text to label.
-  base::scoped_nsobject<NSMutableAttributedString> attributedText(
-      [[NSMutableAttributedString alloc] initWithString:textString]);
+  NSMutableAttributedString* attributedText =
+      [[NSMutableAttributedString alloc] initWithString:textString];
   [attributedText setAttributes:attributes
                           range:NSMakeRange(0, textString.length)];
   text.attributedText = attributedText;
   [_linkController addLinkWithRange:linkRange
                                 url:GURL("contextualSearch://settings")];
   text.numberOfLines = 0;
 
   UIFont* buttonFont =
       [[MDFRobotoFontLoader sharedInstance] mediumFontOfSize:kButtonFontSize];
 
   // Create accept and decline buttons with dimensions defined by the
   // minimum height and width constants.
-  MDCFlatButton* acceptButton = [[[MDCFlatButton alloc] init] autorelease];
+  MDCFlatButton* acceptButton = [[MDCFlatButton alloc] init];
   acceptButton.hasOpaqueBackground = YES;
   acceptButton.inkColor =
       [[[MDCPalette cr_bluePalette] tint300] colorWithAlphaComponent:0.5f];
   [acceptButton setBackgroundColor:[[MDCPalette cr_bluePalette] tint500]
                           forState:UIControlStateNormal];
   [acceptButton setBackgroundColor:[UIColor colorWithWhite:0.6f alpha:1.0f]
                           forState:UIControlStateDisabled];
   [constraints addObjectsFromArray:@[
     [acceptButton.widthAnchor
         constraintGreaterThanOrEqualToConstant:kButtonMinWidth],
     [acceptButton.heightAnchor constraintEqualToConstant:kButtonHeight]
   ]];
   [acceptButton
       setTitle:l10n_util::GetNSString(IDS_IOS_CONTEXTUAL_SEARCH_GOT_IT_BUTTON)
       forState:UIControlStateNormal];
   acceptButton.customTitleColor = [UIColor whiteColor];
   [acceptButton addTarget:_delegate
                    action:@selector(promoViewAcceptTapped)
          forControlEvents:UIControlEventTouchUpInside];
   [acceptButton.titleLabel setFont:buttonFont];
 
   UIColor* customTitleColor = [[MDCPalette cr_bluePalette] tint500];
-  MDCButton* declineButton = [[[MDCFlatButton alloc] init] autorelease];
+  MDCButton* declineButton = [[MDCFlatButton alloc] init];
   [constraints addObjectsFromArray:@[
     [declineButton.widthAnchor
         constraintGreaterThanOrEqualToConstant:kButtonMinWidth],
     [declineButton.heightAnchor constraintEqualToConstant:kButtonHeight]
   ]];
   [declineButton setTitleColor:customTitleColor forState:UIControlStateNormal];
   [declineButton
       setTitle:l10n_util::GetNSString(IDS_IOS_CONTEXTUAL_SEARCH_PROMO_OPTOUT)
       forState:UIControlStateNormal];
   [declineButton addTarget:_delegate
                     action:@selector(promoViewDeclineTapped)
           forControlEvents:UIControlEventTouchUpInside];
   [declineButton.titleLabel setFont:buttonFont];
 
   // Create the divider (a simple colored view) with height defined by
   // |kDividerHeight| and width spanning this view's width.
-  UIView* divider = [[[UIView alloc] initWithFrame:CGRectZero] autorelease];
+  UIView* divider = [[UIView alloc] initWithFrame:CGRectZero];
   divider.backgroundColor = [UIColor colorWithWhite:0.745 alpha:1.0];
   [constraints addObjectsFromArray:@[
     [divider.widthAnchor constraintEqualToAnchor:self.widthAnchor],
     [divider.heightAnchor constraintEqualToConstant:kDividerHeight],
   ]];
 
   self.translatesAutoresizingMaskIntoConstraints = NO;
   text.translatesAutoresizingMaskIntoConstraints = NO;
   acceptButton.translatesAutoresizingMaskIntoConstraints = NO;
   declineButton.translatesAutoresizingMaskIntoConstraints = NO;
@@ skipping 26 matching lines @@
         constraintEqualToAnchor:declineButton.trailingAnchor
                        constant:kButtonSeparator],
     [acceptButton.trailingAnchor
         constraintEqualToAnchor:self.layoutMarginsGuide.trailingAnchor],
     // Divider is centered horizontally at the bottom of the view.
     [divider.bottomAnchor constraintEqualToAnchor:self.bottomAnchor],
     [divider.centerXAnchor constraintEqualToAnchor:self.centerXAnchor],
   ]];
 
   [NSLayoutConstraint activateConstraints:constraints];
-  _constraints.reset([constraints retain]);
+  _constraints = constraints;
 
   return self;
 }
 
 - (void)dealloc {
   // Fix for crbug.com/591043 -- Some constraints applying to autoreleased
   // views may remain active with pointers to the to-be-deallocated views
   // after the views are no longer being displayed. This ensures that all
   // constraints are disabled and will not be applied even if some subviews
   // are lingering.
   [NSLayoutConstraint deactivateConstraints:_constraints];
-  [super dealloc];
 }
 
 - (void)setHidden:(BOOL)hidden {
   if (!hidden && self.disabled)
     return;
   [self setClosure:hidden ? 0.0 : 1.0];
   [super setHidden:hidden];
 }
 
 - (void)setClosure:(CGFloat)closure {
@@ skipping 24 matching lines @@
     self.hidden = NO;
   }
 }
 
 - (void)panelWillPromote:(ContextualSearchPanelView*)panel {
   _delegate = nil;
   [panel removeMotionObserver:self];
 }
 
 @end