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

chrome/browser/BUILD.gn

 # Copyright 2014 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("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 365 matching lines @@
     "download/download_target_determiner_delegate.h",
     "download/download_target_info.cc",
     "download/download_target_info.h",
     "download/download_task_scheduler_impl.cc",
     "download/download_task_scheduler_impl.h",
     "download/download_ui_controller.cc",
     "download/download_ui_controller.h",
     "download/drag_download_item.h",
     "download/save_package_file_picker.cc",
     "download/save_package_file_picker.h",
+    "download/trusted_sources_manager.cc",
+    "download/trusted_sources_manager.h",
+    "download/trusted_sources_manager_posix.cc",
+    "download/trusted_sources_manager_win.cc",
     "engagement/important_sites_usage_counter.cc",
     "engagement/important_sites_usage_counter.h",
     "engagement/important_sites_util.cc",
     "engagement/important_sites_util.h",
     "engagement/site_engagement_helper.cc",
     "engagement/site_engagement_helper.h",
     "engagement/site_engagement_metrics.cc",
     "engagement/site_engagement_metrics.h",
     "engagement/site_engagement_observer.cc",
     "engagement/site_engagement_observer.h",
@@ skipping 4207 matching lines @@
       "//components/search_engines",
       "//rlz:rlz_lib",
     ]
   }
 }
 
 service_manifest("preferences_forwarder_manifest") {
   name = "preferences_forwarder"
   source = "prefs/forwarder_manifest.json"
 }