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

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

Index: ios/chrome/browser/ui/ntp/new_tab_page_bar_item.mm
diff --git a/ios/chrome/browser/ui/ntp/new_tab_page_bar_item.mm b/ios/chrome/browser/ui/ntp/new_tab_page_bar_item.mm
index 915497f33e479743945e6ee18258c2780cc13507..c871c3418903870e61e9cf4e962138c545711be9 100644
--- a/ios/chrome/browser/ui/ntp/new_tab_page_bar_item.mm
+++ b/ios/chrome/browser/ui/ntp/new_tab_page_bar_item.mm
@@ -4,29 +4,20 @@
 
 #import "ios/chrome/browser/ui/ntp/new_tab_page_bar_item.h"
 
-#include "base/mac/objc_property_releaser.h"
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
 
-@implementation NewTabPageBarItem {
-  // Title of the button.
-  NSString* title_;
-  // A numeric identifier.
-  NSUInteger identifier_;
-  // Tabbar image.
-  UIImage* image_;
-  // New tab page view.
-  __unsafe_unretained UIView* view_;  // weak
-  base::mac::ObjCPropertyReleaser propertyReleaser_NewTabPageBarItem_;
-}
-
-@synthesize title = title_;
-@synthesize identifier = identifier_;
-@synthesize image = image_;
-@synthesize view = view_;
+@implementation NewTabPageBarItem
+@synthesize title;
+@synthesize identifier;
+@synthesize image;
+@synthesize view;
 
 + (NewTabPageBarItem*)newTabPageBarItemWithTitle:(NSString*)title
                                       identifier:(NSUInteger)identifier
                                            image:(UIImage*)image {
-  NewTabPageBarItem* item = [[[NewTabPageBarItem alloc] init] autorelease];
+  NewTabPageBarItem* item = [[NewTabPageBarItem alloc] init];
   if (item) {
     item.title = title;
     item.identifier = identifier;
@@ -35,12 +26,4 @@
   return item;
 }
 
-- (id)init {
-  self = [super init];
-  if (self) {
-    propertyReleaser_NewTabPageBarItem_.Init(self, [NewTabPageBarItem class]);
-  }
-  return self;
-}
-
 @end