Refactor safe-browsing build-config definitions.

chrome/utility/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/crypto.gni")
 import("//build/config/features.gni")
 
 gypi_values = exec_script(
     "//build/gypi_to_gn.py",
     [ rebase_path("../chrome_utility.gypi") ],
@@ skipping 72 matching lines @@
       "printing_handler.h",
     ]
   }
 
   if (!enable_mdns) {
     sources -= [
       "local_discovery/service_discovery_message_handler.cc",
       "local_discovery/service_discovery_message_handler.h",
     ]
   }
-
-  if (safe_browsing_mode == 1) {
-    defines += [ "FULL_SAFE_BROWSING" ]
-  }
 }