Add a new group policy to disable safe browsing for files downloaded from trusted sources.

chrome/browser/profiles/profile_impl.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/profiles/profile_impl.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
@@ skipping 381 matching lines @@
 #if defined(OS_IOS) || defined(OS_ANDROID)
   uint32_t home_page_flags = PrefRegistry::NO_REGISTRATION_FLAGS;
 #else
   uint32_t home_page_flags = user_prefs::PrefRegistrySyncable::SYNCABLE_PREF;
 #endif
   registry->RegisterStringPref(prefs::kHomePage,
                                std::string(),
                                home_page_flags);
   registry->RegisterStringPref(prefs::kNewTabPageLocationOverride,
                                std::string());
-  registry->RegisterIntegerPref(prefs::kDownloadRestrictions, 0);
 
 #if BUILDFLAG(ENABLE_PRINTING)
   registry->RegisterBooleanPref(prefs::kPrintingEnabled, true);
 #endif
   registry->RegisterBooleanPref(prefs::kPrintPreviewDisabled, false);
   registry->RegisterStringPref(
       prefs::kPrintPreviewDefaultDestinationSelectionRules, std::string());
   registry->RegisterBooleanPref(prefs::kForceEphemeralProfiles, false);
   registry->RegisterBooleanPref(prefs::kEnableMediaRouter, true);
 #if !defined(OS_ANDROID)
@@ skipping 981 matching lines @@
       BrowserThread::GetTaskRunnerForThread(BrowserThread::IO));
 }
 
 std::unique_ptr<service_manager::Service> ProfileImpl::CreateIdentityService() {
   SigninManagerBase* signin_manager = SigninManagerFactory::GetForProfile(this);
   ProfileOAuth2TokenService* token_service =
       ProfileOAuth2TokenServiceFactory::GetForProfile(this);
   return base::MakeUnique<identity::IdentityService>(signin_manager,
                                                      token_service);
 }