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

ios/chrome/browser/passwords/ios_chrome_password_manager_infobar_delegate.mm

Index: ios/chrome/browser/passwords/ios_chrome_password_manager_infobar_delegate.mm
diff --git a/ios/chrome/browser/passwords/ios_chrome_password_manager_infobar_delegate.mm b/ios/chrome/browser/passwords/ios_chrome_password_manager_infobar_delegate.mm
index db7cea288ee4807706b5d6e7953853ad8986ddec..ecbb0ab6076f114c83587235a4a9aa4e0deeffeb 100644
--- a/ios/chrome/browser/passwords/ios_chrome_password_manager_infobar_delegate.mm
+++ b/ios/chrome/browser/passwords/ios_chrome_password_manager_infobar_delegate.mm
@@ -6,7 +6,6 @@
 
 #include <utility>
 
-#include "base/mac/scoped_nsobject.h"
 #include "base/strings/string16.h"
 #include "components/password_manager/core/browser/password_form_manager.h"
 #include "components/password_manager/core/browser/password_manager_constants.h"
@@ -19,6 +18,10 @@
 #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
+
 IOSChromePasswordManagerInfoBarDelegate::
     ~IOSChromePasswordManagerInfoBarDelegate() {
   password_manager::metrics_util::LogUIDismissalReason(infobar_response_);
@@ -49,12 +52,12 @@ int IOSChromePasswordManagerInfoBarDelegate::GetIconId() const {
 
 bool IOSChromePasswordManagerInfoBarDelegate::LinkClicked(
     WindowOpenDisposition disposition) {
-  base::scoped_nsobject<OpenUrlCommand> command([[OpenUrlCommand alloc]
+  OpenUrlCommand* command = [[OpenUrlCommand alloc]
        initWithURL:GURL(password_manager::kPasswordManagerHelpCenterSmartLock)
           referrer:web::Referrer()
        inIncognito:NO
       inBackground:NO
-          appendTo:kCurrentTab]);
+          appendTo:kCurrentTab];
   UIWindow* mainWindow = [[UIApplication sharedApplication] keyWindow];
   [mainWindow chromeExecuteCommand:command];
   return true;