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

ios/chrome/browser/ui/ntp/new_tab_page_toolbar_controller.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/ntp/new_tab_page_toolbar_controller.h"
 
 #include "base/logging.h"
-#include "base/mac/scoped_nsobject.h"
 #include "base/metrics/user_metrics.h"
 #include "base/metrics/user_metrics_action.h"
 #include "components/strings/grit/components_strings.h"
 #include "components/toolbar/toolbar_model.h"
 #import "ios/chrome/browser/ui/commands/UIKit+ChromeExecuteCommand.h"
 #import "ios/chrome/browser/ui/commands/generic_chrome_command.h"
 #include "ios/chrome/browser/ui/commands/ios_command_ids.h"
 #import "ios/chrome/browser/ui/ntp/google_landing_data_source.h"
 #import "ios/chrome/browser/ui/rtl_geometry.h"
 #include "ios/chrome/browser/ui/toolbar/toolbar_resource_macros.h"
 #import "ios/chrome/browser/ui/toolbar/web_toolbar_controller.h"
 #import "ios/chrome/browser/ui/uikit_ui_util.h"
 #include "ui/base/l10n/l10n_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 using base::UserMetricsAction;
 
 namespace {
 
 const CGFloat kButtonYOffset = 4.0;
 const CGFloat kBackButtonLeading = 0;
 const CGFloat kForwardButtonLeading = 48;
 const CGFloat kOmniboxFocuserLeading = 96;
 const CGSize kBackButtonSize = {48, 48};
 const CGSize kForwardButtonSize = {48, 48};
 const CGSize kOmniboxFocuserSize = {128, 48};
 
 enum {
   NTPToolbarButtonNameBack = NumberOfToolbarButtonNames,
   NTPToolbarButtonNameForward,
   NumberOfNTPToolbarButtonNames,
 };
 
 }  // namespace
 
 @interface NewTabPageToolbarController () {
-  base::scoped_nsobject<UIButton> _backButton;
-  base::scoped_nsobject<UIButton> _forwardButton;
-  base::scoped_nsobject<UIButton> _omniboxFocuser;
+  UIButton* _backButton;
+  UIButton* _forwardButton;
+  UIButton* _omniboxFocuser;
 }
 
 // |YES| if the google landing toolbar can show the forward arrow.
 @property(nonatomic, assign) BOOL canGoForward;
 
 // |YES| if the google landing toolbar can show the back arrow.
 @property(nonatomic, assign) BOOL canGoBack;
 
 @end
 
 @implementation NewTabPageToolbarController
 
 @synthesize dispatcher = _dispatcher;
 @synthesize canGoForward = _canGoForward;
 @synthesize canGoBack = _canGoBack;
 
 - (instancetype)init {
   self = [super initWithStyle:ToolbarControllerStyleLightMode];
   if (self) {
     [self.backgroundView setHidden:YES];
 
     CGFloat boundingWidth = self.view.bounds.size.width;
     LayoutRect backButtonLayout =
         LayoutRectMake(kBackButtonLeading, boundingWidth, kButtonYOffset,
                        kBackButtonSize.width, kBackButtonSize.height);
-    _backButton.reset(
-        [[UIButton alloc] initWithFrame:LayoutRectGetRect(backButtonLayout)]);
+    _backButton =
+        [[UIButton alloc] initWithFrame:LayoutRectGetRect(backButtonLayout)];
     [_backButton
         setAutoresizingMask:UIViewAutoresizingFlexibleTrailingMargin() |
                             UIViewAutoresizingFlexibleBottomMargin];
     LayoutRect forwardButtonLayout =
         LayoutRectMake(kForwardButtonLeading, boundingWidth, kButtonYOffset,
                        kForwardButtonSize.width, kForwardButtonSize.height);
-    _forwardButton.reset([[UIButton alloc]
-        initWithFrame:LayoutRectGetRect(forwardButtonLayout)]);
+    _forwardButton =
+        [[UIButton alloc] initWithFrame:LayoutRectGetRect(forwardButtonLayout)];
     [_forwardButton
         setAutoresizingMask:UIViewAutoresizingFlexibleTrailingMargin() |
                             UIViewAutoresizingFlexibleBottomMargin];
     LayoutRect omniboxFocuserLayout =
         LayoutRectMake(kOmniboxFocuserLeading, boundingWidth, kButtonYOffset,
                        kOmniboxFocuserSize.width, kOmniboxFocuserSize.height);
-    _omniboxFocuser.reset([[UIButton alloc]
-        initWithFrame:LayoutRectGetRect(omniboxFocuserLayout)]);
+    _omniboxFocuser = [[UIButton alloc]
+        initWithFrame:LayoutRectGetRect(omniboxFocuserLayout)];
     [_omniboxFocuser
         setAccessibilityLabel:l10n_util::GetNSString(IDS_ACCNAME_LOCATION)];
 
     [_omniboxFocuser setAutoresizingMask:UIViewAutoresizingFlexibleWidth];
 
     [self.view addSubview:_backButton];
     [self.view addSubview:_forwardButton];
     [self.view addSubview:_omniboxFocuser];
     [_backButton setImageEdgeInsets:UIEdgeInsetsMakeDirected(0, 0, 0, -10)];
     [_forwardButton setImageEdgeInsets:UIEdgeInsetsMakeDirected(0, -7, 0, 0)];
 
     // Set up the button images.
     [self setUpButton:_backButton
            withImageEnum:NTPToolbarButtonNameBack
          forInitialState:UIControlStateDisabled
         hasDisabledImage:YES
            synchronously:NO];
     [self setUpButton:_forwardButton
            withImageEnum:NTPToolbarButtonNameForward
          forInitialState:UIControlStateDisabled
         hasDisabledImage:YES
            synchronously:NO];
 
-    base::scoped_nsobject<UILongPressGestureRecognizer> backLongPress(
+    UILongPressGestureRecognizer* backLongPress =
         [[UILongPressGestureRecognizer alloc]
             initWithTarget:self
-                    action:@selector(handleLongPress:)]);
+                    action:@selector(handleLongPress:)];
     [_backButton addGestureRecognizer:backLongPress];
-    base::scoped_nsobject<UILongPressGestureRecognizer> forwardLongPress(
+    UILongPressGestureRecognizer* forwardLongPress =
         [[UILongPressGestureRecognizer alloc]
             initWithTarget:self
-                    action:@selector(handleLongPress:)]);
+                    action:@selector(handleLongPress:)];
     [_forwardButton addGestureRecognizer:forwardLongPress];
     [_backButton setTag:IDC_BACK];
     [_forwardButton setTag:IDC_FORWARD];
 
     [_omniboxFocuser addTarget:self
                         action:@selector(focusOmnibox:)
               forControlEvents:UIControlEventTouchUpInside];
 
     SetA11yLabelAndUiAutomationName(_backButton, IDS_ACCNAME_BACK, @"Back");
     SetA11yLabelAndUiAutomationName(_forwardButton, IDS_ACCNAME_FORWARD,
@@ skipping 11 matching lines @@
   if (imageEnum < NumberOfToolbarButtonNames)
     return [super imageShouldFlipForRightToLeftLayoutDirection:imageEnum];
   if (imageEnum == NTPToolbarButtonNameBack ||
       imageEnum == NTPToolbarButtonNameForward) {
     return YES;
   }
   return NO;
 }
 
 - (int)imageEnumForButton:(UIButton*)button {
-  if (button == _backButton.get())
+  if (button == _backButton)
     return NTPToolbarButtonNameBack;
-  if (button == _forwardButton.get())
+  if (button == _forwardButton)
     return NTPToolbarButtonNameForward;
   return [super imageEnumForButton:button];
 }
 
 - (int)imageIdForImageEnum:(int)index
                      style:(ToolbarControllerStyle)style
                   forState:(ToolbarButtonUIState)state {
   DCHECK(style < ToolbarControllerStyleMaxStyles);
   DCHECK(state < NumberOfToolbarButtonUIStates);
 
   if (index >= NumberOfNTPToolbarButtonNames)
     NOTREACHED();
   if (index < NumberOfToolbarButtonNames)
     return [super imageIdForImageEnum:index style:style forState:state];
 
   index -= NumberOfToolbarButtonNames;
 
   const int numberOfAddedNames =
       NumberOfNTPToolbarButtonNames - NumberOfToolbarButtonNames;
   // Name, style [light, dark], UIControlState [normal, pressed, disabled]
   static int
       buttonImageIds[numberOfAddedNames][2][NumberOfToolbarButtonUIStates] = {
           TOOLBAR_IDR_THREE_STATE(BACK), TOOLBAR_IDR_THREE_STATE(FORWARD),
       };
   return buttonImageIds[index][style][state];
 }
 
 - (IBAction)recordUserMetrics:(id)sender {
-  if (sender == _backButton.get()) {
+  if (sender == _backButton) {
     base::RecordAction(UserMetricsAction("MobileToolbarBack"));
-  } else if (sender == _forwardButton.get()) {
+  } else if (sender == _forwardButton) {
     base::RecordAction(UserMetricsAction("MobileToolbarForward"));
   } else {
     [super recordUserMetrics:sender];
   }
 }
 
 - (void)handleLongPress:(UILongPressGestureRecognizer*)gesture {
   if (gesture.state != UIGestureRecognizerStateBegan)
     return;
 
-  if (gesture.view == _backButton.get()) {
-    base::scoped_nsobject<GenericChromeCommand> command(
-        [[GenericChromeCommand alloc] initWithTag:IDC_SHOW_BACK_HISTORY]);
+  if (gesture.view == _backButton) {
+    GenericChromeCommand* command =
+        [[GenericChromeCommand alloc] initWithTag:IDC_SHOW_BACK_HISTORY];
     [_backButton chromeExecuteCommand:command];
-  } else if (gesture.view == _forwardButton.get()) {
-    base::scoped_nsobject<GenericChromeCommand> command(
-        [[GenericChromeCommand alloc] initWithTag:IDC_SHOW_FORWARD_HISTORY]);
+  } else if (gesture.view == _forwardButton) {
+    GenericChromeCommand* command =
+        [[GenericChromeCommand alloc] initWithTag:IDC_SHOW_FORWARD_HISTORY];
     [_forwardButton chromeExecuteCommand:command];
   }
 }
 
 - (void)hideViewsForNewTabPage:(BOOL)hide {
   [super hideViewsForNewTabPage:hide];
   // Show the back/forward buttons if there is forward history.
   BOOL forwardEnabled = self.canGoForward;
   [_backButton setHidden:!forwardEnabled && hide];
   [_backButton setEnabled:self.canGoBack];
   [_forwardButton setHidden:!forwardEnabled && hide];
 }
 
 - (void)focusOmnibox:(id)sender {
   [self.dispatcher focusFakebox];
 }
 
 - (IBAction)stackButtonTouchDown:(id)sender {
   [self.dispatcher prepareToEnterTabSwitcher:self];
 }
 
 @end