Convert //ios from scoped_ptr to std::unique_ptr.

ios/chrome/browser/passwords/credential_manager.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/passwords/credential_manager.h"
 
 #include <utility>
 
 #include "base/ios/ios_util.h"
 #import "base/ios/weak_nsobject.h"
@@ skipping 176 matching lines @@
   // doesn't imply that the credential will be stored, just that it might be.
   // It isn't the page's concern to know whether the storage took place or not.
   ResolvePromise(request_id);
 
   // Do nothing if the password manager isn't active.
   if (!client_->IsSavingAndFillingEnabledForCurrentPage())
     return;
 
   // Store the signed-in credential so that the user can save it, if desired.
   // Prompting the user and saving are handled by the PasswordFormManager.
-  scoped_ptr<autofill::PasswordForm> form(
+  std::unique_ptr<autofill::PasswordForm> form(
       password_manager::CreatePasswordFormFromCredentialInfo(
           CredentialInfoFromWebCredential(credential), page_url));
   form->skip_zero_click = !IsZeroClickAllowed();
 
   // TODO(mkwst): This is a stub; we should be checking the PasswordStore to
   // determine whether or not the credential exists, and calling UpdateLogin
   // accordingly.
   form_manager_.reset(
       new password_manager::CredentialManagerPasswordFormManager(
           client_, driver_->AsWeakPtr(), *form, this));
@@ skipping 161 matching lines @@
 bool CredentialManager::GetUrlWithAbsoluteTrust(GURL* page_url) {
   web::URLVerificationTrustLevel trust_level =
       web::URLVerificationTrustLevel::kNone;
   const GURL possibly_untrusted_url(web_state()->GetCurrentURL(&trust_level));
   if (trust_level == web::URLVerificationTrustLevel::kAbsolute) {
     *page_url = possibly_untrusted_url;
     return true;
   }
   return false;
 }