Update AutoImport to import nothing by default (in absence of policy and master_prefs).

chrome/browser/prefs/browser_prefs.cc

 // Copyright 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/prefs/browser_prefs.h"
 
 #include <string>
 
 #include "base/files/file_util.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 455 matching lines @@
   ChromeContentBrowserClient::RegisterProfilePrefs(registry);
   ChromeVersionService::RegisterProfilePrefs(registry);
   chrome_browser_net::HttpServerPropertiesManagerFactory::RegisterProfilePrefs(
       registry);
   chrome_browser_net::Predictor::RegisterProfilePrefs(registry);
   chrome_browser_net::RegisterPredictionOptionsProfilePrefs(registry);
   chrome_prefs::RegisterProfilePrefs(registry);
   dom_distiller::DistilledPagePrefs::RegisterProfilePrefs(registry);
   doodle::DoodleService::RegisterProfilePrefs(registry);
   DownloadPrefs::RegisterProfilePrefs(registry);
+  first_run::RegisterProfilePrefs(registry);
   HostContentSettingsMap::RegisterProfilePrefs(registry);
   ImportantSitesUtil::RegisterProfilePrefs(registry);
   IncognitoModePrefs::RegisterProfilePrefs(registry);
   InstantUI::RegisterProfilePrefs(registry);
   NavigationCorrectionTabObserver::RegisterProfilePrefs(registry);
   MediaCaptureDevicesDispatcher::RegisterProfilePrefs(registry);
   MediaDeviceIDSalt::RegisterProfilePrefs(registry);
   MediaStreamDevicesController::RegisterProfilePrefs(registry);
   NetHttpSessionParamsObserver::RegisterProfilePrefs(registry);
   NotifierStateTracker::RegisterProfilePrefs(registry);
@@ skipping 297 matching lines @@
     if (distro_dict &&
         distro_dict->GetInteger(kDistroRlzPingDelay, &rlz_ping_delay)) {
       profile_prefs->SetInteger(prefs::kRlzPingDelaySeconds, rlz_ping_delay);
     }
 #endif  // BUILDFLAG(ENABLE_RLZ)
     profile_prefs->ClearPref(kDistroDict);
   }
 }
 
 }  // namespace chrome