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

ios/chrome/browser/ui/tab_switcher/tab_switcher_panel_overlay_view.mm

 // Copyright 2015 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/tab_switcher/tab_switcher_panel_overlay_view.h"
 
-#import "base/mac/scoped_nsobject.h"
 #include "base/metrics/user_metrics.h"
 #include "base/metrics/user_metrics_action.h"
 #import "ios/chrome/browser/ui/colors/MDCPalette+CrAdditions.h"
 #import "ios/chrome/browser/ui/commands/UIKit+ChromeExecuteCommand.h"
 #include "ios/chrome/browser/ui/commands/ios_command_ids.h"
 #import "ios/chrome/browser/ui/commands/show_signin_command.h"
 #import "ios/chrome/browser/ui/material_components/activity_indicator.h"
 #import "ios/chrome/browser/ui/sync/sync_util.h"
 #import "ios/chrome/browser/ui/tab_switcher/tab_switcher_model.h"
 #import "ios/chrome/browser/ui/uikit_ui_util.h"
 #include "ios/chrome/grit/ios_chromium_strings.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
 #import "ios/third_party/material_components_ios/src/components/ActivityIndicator/src/MaterialActivityIndicator.h"
 #import "ios/third_party/material_components_ios/src/components/Buttons/src/MaterialButtons.h"
 #import "ios/third_party/material_components_ios/src/components/ShadowElevations/src/MaterialShadowElevations.h"
 #import "ios/third_party/material_components_ios/src/components/Typography/src/MaterialTypography.h"
 #include "ui/base/l10n/l10n_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 TabSwitcherPanelOverlayType PanelOverlayTypeFromSignInPanelsType(
     TabSwitcherSignInPanelsType signInPanelType) {
   switch (signInPanelType) {
     case TabSwitcherSignInPanelsType::PANEL_USER_SIGNED_OUT:
       return TabSwitcherPanelOverlayType::OVERLAY_PANEL_USER_SIGNED_OUT;
     case TabSwitcherSignInPanelsType::PANEL_USER_SIGNED_IN_SYNC_OFF:
       return TabSwitcherPanelOverlayType::OVERLAY_PANEL_USER_SIGNED_IN_SYNC_OFF;
     case TabSwitcherSignInPanelsType::PANEL_USER_SIGNED_IN_SYNC_IN_PROGRESS:
       return TabSwitcherPanelOverlayType::
           OVERLAY_PANEL_USER_SIGNED_IN_SYNC_IN_PROGRESS;
@@ skipping 19 matching lines @@
 - (void)updateText;
 // Updates the button target and tag according to the current |overlayType|.
 - (void)updateButtonTarget;
 // Sends a SignIn chrome command.
 - (void)showSignIn;
 
 @end
 
 @implementation TabSwitcherPanelOverlayView {
   ios::ChromeBrowserState* _browserState;  // Weak.
-  base::scoped_nsobject<UIView> _container;
-  base::scoped_nsobject<UILabel> _titleLabel;
-  base::scoped_nsobject<UILabel> _subtitleLabel;
-  base::scoped_nsobject<MDCButton> _textButton;
-  base::scoped_nsobject<MDCButton> _floatingButton;
-  base::scoped_nsobject<MDCActivityIndicator> _activityIndicator;
+  UIView* _container;
+  UILabel* _titleLabel;
+  UILabel* _subtitleLabel;
+  MDCButton* _textButton;
+  MDCButton* _floatingButton;
+  MDCActivityIndicator* _activityIndicator;
   std::string _recordedMetricString;
 }
 
 @synthesize overlayType = _overlayType;
 
 - (instancetype)initWithFrame:(CGRect)frame
                  browserState:(ios::ChromeBrowserState*)browserState {
   self = [super initWithFrame:frame];
   if (self) {
     _browserState = browserState;
     // Create and add container. Will be vertically and horizontally centered.
-    _container.reset([[UIView alloc] initWithFrame:CGRectZero]);
+    _container = [[UIView alloc] initWithFrame:CGRectZero];
     [_container setTranslatesAutoresizingMaskIntoConstraints:NO];
     [self addSubview:_container];
 
     // Create and add title label to the container.
-    _titleLabel.reset([[UILabel alloc] initWithFrame:CGRectZero]);
+    _titleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
     [_titleLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
     [_titleLabel setFont:[MDCTypography headlineFont]];
     [_titleLabel
         setTextColor:[UIColor
                          colorWithWhite:1
                                   alpha:[MDCTypography headlineFontOpacity]]];
     [_titleLabel setLineBreakMode:NSLineBreakByWordWrapping];
     [_titleLabel setNumberOfLines:0];
     [_titleLabel setTextAlignment:NSTextAlignmentCenter];
     [_container addSubview:_titleLabel];
 
     // Create and add subtitle label to the container.
-    _subtitleLabel.reset([[UILabel alloc] initWithFrame:CGRectZero]);
+    _subtitleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
     [_subtitleLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
     [_subtitleLabel setFont:[MDCTypography subheadFont]];
     [_subtitleLabel
         setTextColor:[UIColor
                          colorWithWhite:1
                                   alpha:[MDCTypography display1FontOpacity]]];
     [_subtitleLabel setNumberOfLines:0];
     [_container addSubview:_subtitleLabel];
 
     // Create and add button to the container.
-    _textButton.reset([[MDCRaisedButton alloc] init]);
+    _textButton = [[MDCRaisedButton alloc] init];
     [_textButton setElevation:MDCShadowElevationNone
                      forState:UIControlStateNormal];
     MDCPalette* buttonPalette = [MDCPalette cr_bluePalette];
     [_textButton
         setInkColor:[[buttonPalette tint300] colorWithAlphaComponent:0.5f]];
     [_textButton setBackgroundColor:[buttonPalette tint500]
                            forState:UIControlStateNormal];
     [_textButton setBackgroundColor:[UIColor colorWithWhite:0.8f alpha:1.0f]
                            forState:UIControlStateDisabled];
     [_textButton setTranslatesAutoresizingMaskIntoConstraints:NO];
     [[_textButton imageView] setTintColor:[UIColor whiteColor]];
     [_textButton setCustomTitleColor:[UIColor whiteColor]];
     [_container addSubview:_textButton];
 
     // Create and add floatingButton to the container.
-    _floatingButton.reset([[MDCFloatingButton alloc] init]);
+    _floatingButton = [[MDCFloatingButton alloc] init];
     [_floatingButton setTranslatesAutoresizingMaskIntoConstraints:NO];
     [[_floatingButton imageView] setTintColor:[UIColor whiteColor]];
     [_container addSubview:_floatingButton];
 
     // Create and add activity indicator to the container.
-    _activityIndicator.reset(
-        [[MDCActivityIndicator alloc] initWithFrame:CGRectZero]);
+    _activityIndicator =
+        [[MDCActivityIndicator alloc] initWithFrame:CGRectZero];
     [_activityIndicator setCycleColors:ActivityIndicatorBrandedCycleColors()];
     [_activityIndicator setTranslatesAutoresizingMaskIntoConstraints:NO];
     [_container addSubview:_activityIndicator];
 
     // Set constraints on all of the container's subviews.
     AddSameCenterXConstraint(_container, _titleLabel);
     AddSameCenterXConstraint(_container, _subtitleLabel);
     NSDictionary* viewsDictionary = @{
-      @"title" : _titleLabel.get(),
-      @"subtitle" : _subtitleLabel.get(),
-      @"button" : _textButton.get(),
-      @"floatingButton" : _floatingButton.get(),
-      @"activityIndicator" : _activityIndicator.get(),
+      @"title" : _titleLabel,
+      @"subtitle" : _subtitleLabel,
+      @"button" : _textButton,
+      @"floatingButton" : _floatingButton,
+      @"activityIndicator" : _activityIndicator,
     };
     AddSameCenterXConstraint(_container, _textButton);
     AddSameCenterXConstraint(_container, _floatingButton);
     AddSameCenterXConstraint(_container, _activityIndicator);
     NSArray* constraints = @[
       @"V:|-0-[title]-12-[subtitle]-48-[button]-0-|",
       @"V:[subtitle]-35-[floatingButton(==48)]-0-|",
       @"V:[subtitle]-24-[activityIndicator]", @"H:|-[title]-|",
       @"H:|-[subtitle]-|", @"H:[button(>=180)]", @"H:[floatingButton(==48)]"
     ];
     ApplyVisualConstraints(constraints, viewsDictionary, _container);
 
     // Sets the container's width relative to the parent.
     ApplyVisualConstraintsWithMetrics(
         @[
           @"H:|-(>=0)-[container(==containerWidth@999)]-(>=0)-|",
         ],
-        @{ @"container" : _container.get() },
+        @{ @"container" : _container },
         @{ @"containerWidth" : @(kContainerWidth) }, self);
   }
   return self;
 }
 
 - (void)layoutSubviews {
   [super layoutSubviews];
   CGRect containerFrame = [_container frame];
   containerFrame.origin.x =
       (self.frame.size.width - containerFrame.size.width) / 2;
@@ skipping 19 matching lines @@
   UIImage* buttonImage = nil;
   NSString* buttonAccessibilityLabel = nil;
   UIColor* floatingButtonNormalBackgroundColor = nil;
   UIColor* floatingButtonDisabledBackgroundColor = nil;
   UIColor* floatingButtonInkColor = nil;
   BOOL spinnerIsHidden = YES;
   switch (self.overlayType) {
     case TabSwitcherPanelOverlayType::OVERLAY_PANEL_EMPTY:
       break;
     case TabSwitcherPanelOverlayType::OVERLAY_PANEL_USER_SIGNED_OUT:
-      titleString = [[[NSMutableAttributedString alloc]
+      titleString = [[NSMutableAttributedString alloc]
           initWithString:l10n_util::GetNSString(
-                             IDS_IOS_TAB_SWITCHER_SIGN_IN_ACCOUNT_TITLE)]
-          autorelease];
-      subtitleString = [[[NSMutableAttributedString alloc]
+                             IDS_IOS_TAB_SWITCHER_SIGN_IN_ACCOUNT_TITLE)];
+      subtitleString = [[NSMutableAttributedString alloc]
           initWithString:l10n_util::GetNSString(
-                             IDS_IOS_TAB_SWITCHER_SIGN_IN_ACCOUNT_PROMO)]
-          autorelease];
+                             IDS_IOS_TAB_SWITCHER_SIGN_IN_ACCOUNT_PROMO)];
       buttonTitle =
           l10n_util::GetNSString(IDS_IOS_TAB_SWITCHER_SIGN_IN_ACCOUNT_BUTTON);
       break;
     case TabSwitcherPanelOverlayType::OVERLAY_PANEL_USER_SIGNED_IN_SYNC_OFF:
-      titleString = [[[NSMutableAttributedString alloc]
+      titleString = [[NSMutableAttributedString alloc]
           initWithString:l10n_util::GetNSString(
-                             IDS_IOS_TAB_SWITCHER_ENABLE_SYNC_TITLE)]
-          autorelease];
-      subtitleString = [[[NSMutableAttributedString alloc]
+                             IDS_IOS_TAB_SWITCHER_ENABLE_SYNC_TITLE)];
+      subtitleString = [[NSMutableAttributedString alloc]
           initWithString:l10n_util::GetNSString(
-                             IDS_IOS_TAB_SWITCHER_SYNC_IS_OFF)] autorelease];
+                             IDS_IOS_TAB_SWITCHER_SYNC_IS_OFF)];
       buttonTitle =
           l10n_util::GetNSString(IDS_IOS_TAB_SWITCHER_ENABLE_SYNC_BUTTON);
       break;
     case TabSwitcherPanelOverlayType::
         OVERLAY_PANEL_USER_SIGNED_IN_SYNC_ON_NO_SESSIONS:
-      titleString = [[[NSMutableAttributedString alloc]
+      titleString = [[NSMutableAttributedString alloc]
           initWithString:l10n_util::GetNSString(
-                             IDS_IOS_TAB_SWITCHER_NO_TABS_TO_SYNC_PROMO)]
-          autorelease];
-      subtitleString = [[[NSMutableAttributedString alloc]
+                             IDS_IOS_TAB_SWITCHER_NO_TABS_TO_SYNC_PROMO)];
+      subtitleString = [[NSMutableAttributedString alloc]
           initWithString:l10n_util::GetNSString(
-                             IDS_IOS_OPEN_TABS_NO_SESSION_INSTRUCTIONS)]
-          autorelease];
+                             IDS_IOS_OPEN_TABS_NO_SESSION_INSTRUCTIONS)];
       break;
     case TabSwitcherPanelOverlayType::
         OVERLAY_PANEL_USER_SIGNED_IN_SYNC_IN_PROGRESS:
-      titleString = [[[NSMutableAttributedString alloc]
+      titleString = [[NSMutableAttributedString alloc]
           initWithString:l10n_util::GetNSString(
-                             IDS_IOS_TAB_SWITCHER_SYNC_IN_PROGRESS_PROMO)]
-          autorelease];
-      subtitleString = [[[NSMutableAttributedString alloc]
+                             IDS_IOS_TAB_SWITCHER_SYNC_IN_PROGRESS_PROMO)];
+      subtitleString = [[NSMutableAttributedString alloc]
           initWithString:l10n_util::GetNSString(
-                             IDS_IOS_TAB_SWITCHER_SYNC_IS_OFF)] autorelease];
+                             IDS_IOS_TAB_SWITCHER_SYNC_IS_OFF)];
       spinnerIsHidden = NO;
       break;
     case TabSwitcherPanelOverlayType::OVERLAY_PANEL_USER_NO_OPEN_TABS:
-      titleString = [[[NSMutableAttributedString alloc]
+      titleString = [[NSMutableAttributedString alloc]
           initWithString:
               l10n_util::GetNSString(
-                  IDS_IOS_TAB_SWITCHER_NO_LOCAL_NON_INCOGNITO_TABS_TITLE)]
-          autorelease];
-      subtitleString = [[[NSMutableAttributedString alloc]
+                  IDS_IOS_TAB_SWITCHER_NO_LOCAL_NON_INCOGNITO_TABS_TITLE)];
+      subtitleString = [[NSMutableAttributedString alloc]
           initWithString:l10n_util::GetNSString(
-                             IDS_IOS_TAB_SWITCHER_NO_LOCAL_NON_INCOGNITO_TABS)]
-          autorelease];
+                             IDS_IOS_TAB_SWITCHER_NO_LOCAL_NON_INCOGNITO_TABS)];
       buttonImage = [UIImage imageNamed:@"tabswitcher_new_tab_fab"];
       buttonImage = [buttonImage
           imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
       floatingButtonInkColor =
           [[[MDCPalette cr_bluePalette] tint300] colorWithAlphaComponent:0.5f];
       floatingButtonNormalBackgroundColor =
           [[MDCPalette cr_bluePalette] tint500];
       floatingButtonDisabledBackgroundColor =
           [UIColor colorWithWhite:0.8f alpha:1.0f];
       buttonAccessibilityLabel =
           l10n_util::GetNSString(IDS_IOS_TAB_SWITCHER_CREATE_NEW_TAB);
       break;
     case TabSwitcherPanelOverlayType::OVERLAY_PANEL_USER_NO_INCOGNITO_TABS:
-      titleString = [[[NSMutableAttributedString alloc]
+      titleString = [[NSMutableAttributedString alloc]
           initWithString:
               l10n_util::GetNSString(
-                  IDS_IOS_TAB_SWITCHER_NO_LOCAL_INCOGNITO_TABS_PROMO)]
-          autorelease];
-      subtitleString = [[[NSMutableAttributedString alloc]
+                  IDS_IOS_TAB_SWITCHER_NO_LOCAL_INCOGNITO_TABS_PROMO)];
+      subtitleString = [[NSMutableAttributedString alloc]
           initWithString:l10n_util::GetNSString(
-                             IDS_IOS_TAB_SWITCHER_NO_LOCAL_INCOGNITO_TABS)]
-          autorelease];
+                             IDS_IOS_TAB_SWITCHER_NO_LOCAL_INCOGNITO_TABS)];
       buttonImage = [UIImage imageNamed:@"tabswitcher_new_tab_fab"];
       buttonImage = [buttonImage
           imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
 
       floatingButtonInkColor =
           [[[MDCPalette greyPalette] tint300] colorWithAlphaComponent:0.25f];
       floatingButtonNormalBackgroundColor = [[MDCPalette greyPalette] tint500];
       floatingButtonDisabledBackgroundColor =
           [UIColor colorWithWhite:0.8f alpha:1.0f];
       buttonAccessibilityLabel =
           l10n_util::GetNSString(IDS_IOS_TAB_SWITCHER_CREATE_NEW_INCOGNITO_TAB);
       break;
   };
 
-  base::scoped_nsobject<NSMutableParagraphStyle> titleStyle(
-      [[NSMutableParagraphStyle alloc] init]);
+  NSMutableParagraphStyle* titleStyle = [[NSMutableParagraphStyle alloc] init];
   [titleStyle setMinimumLineHeight:kTitleMinimumLineHeight];
   [titleStyle setAlignment:NSTextAlignmentCenter];
   [titleStyle setLineBreakMode:NSLineBreakByWordWrapping];
   [titleString addAttribute:NSParagraphStyleAttributeName
                       value:titleStyle
                       range:NSMakeRange(0, [titleString length])];
   [_titleLabel setAttributedText:titleString];
 
-  base::scoped_nsobject<NSMutableParagraphStyle> subtitleStyle(
-      [[NSMutableParagraphStyle alloc] init]);
+  NSMutableParagraphStyle* subtitleStyle =
+      [[NSMutableParagraphStyle alloc] init];
   [subtitleStyle setMinimumLineHeight:kSubtitleMinimunLineHeight];
   [subtitleStyle setAlignment:NSTextAlignmentCenter];
   [subtitleStyle setLineBreakMode:NSLineBreakByWordWrapping];
   [subtitleString addAttribute:NSParagraphStyleAttributeName
                          value:subtitleStyle
                          range:NSMakeRange(0, [subtitleString length])];
   [_subtitleLabel setAttributedText:subtitleString];
 
   [_textButton setTitle:buttonTitle forState:UIControlStateNormal];
   [_textButton setImage:buttonImage forState:UIControlStateNormal];
@@ skipping 70 matching lines @@
                       action:selector
             forControlEvents:UIControlEventTouchUpInside];
   [_floatingButton addTarget:self
                       action:@selector(recordMetrics)
             forControlEvents:UIControlEventTouchUpInside];
   [_floatingButton setHidden:!shouldShowFloatingButton];
 }
 
 - (void)showSignIn {
   base::RecordAction(base::UserMetricsAction("Signin_Signin_FromTabSwitcher"));
-  base::scoped_nsobject<ShowSigninCommand> command([[ShowSigninCommand alloc]
+  ShowSigninCommand* command = [[ShowSigninCommand alloc]
       initWithOperation:AUTHENTICATION_OPERATION_SIGNIN
-      signInAccessPoint:signin_metrics::AccessPoint::
-                            ACCESS_POINT_TAB_SWITCHER]);
+      signInAccessPoint:signin_metrics::AccessPoint::ACCESS_POINT_TAB_SWITCHER];
   [self chromeExecuteCommand:command];
 }
 
 - (void)showSyncSettings {
   [self chromeExecuteCommand:ios_internal::sync::GetSyncCommandForBrowserState(
                                  _browserState)];
 }
 
 - (void)rootViewControllerChromeCommand:(id)command {
   [self chromeExecuteCommand:command];
 }
 
 - (void)recordMetrics {
   if (!_recordedMetricString.length())
     return;
   base::RecordAction(base::UserMetricsAction(_recordedMetricString.c_str()));
 }
 
 @end