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

ios/chrome/browser/ui/ntp/new_tab_page_toolbar_controller.mm

Index: ios/chrome/browser/ui/ntp/new_tab_page_toolbar_controller.mm
diff --git a/ios/chrome/browser/ui/ntp/new_tab_page_toolbar_controller.mm b/ios/chrome/browser/ui/ntp/new_tab_page_toolbar_controller.mm
index 57c3eb39426826bacc380bfa2b70e0bad43bc2cc..ef9a0fd079f9f1e82a48df1ad65933c45f71ce5a 100644
--- a/ios/chrome/browser/ui/ntp/new_tab_page_toolbar_controller.mm
+++ b/ios/chrome/browser/ui/ntp/new_tab_page_toolbar_controller.mm
@@ -5,7 +5,6 @@
 #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"
@@ -20,6 +19,10 @@
 #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 {
@@ -41,9 +44,9 @@ enum {
 }  // 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.
@@ -69,24 +72,24 @@ enum {
     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)];
 
@@ -110,15 +113,15 @@ enum {
         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];
@@ -150,9 +153,9 @@ enum {
 }
 
 - (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];
 }
@@ -181,9 +184,9 @@ enum {
 }
 
 - (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];
@@ -194,13 +197,13 @@ enum {
   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];
   }
 }