Move printing defines to buildflag system.

chrome/service/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/features.gni")
+import("//printing/features/features.gni")
 
 static_library("service") {
   sources = [
     "cloud_print/cdd_conversion_win.cc",
     "cloud_print/cdd_conversion_win.h",
     "cloud_print/cloud_print_auth.cc",
     "cloud_print/cloud_print_auth.h",
     "cloud_print/cloud_print_connector.cc",
     "cloud_print/cloud_print_connector.h",
     "cloud_print/cloud_print_message_handler.cc",
@@ skipping 53 matching lines @@
     configs += [ "//printing:cups" ]
   } else if (is_win) {
     sources += [
       "service_utility_process_host.cc",
       "service_utility_process_host.h",
     ]
   } else {
     sources += [ "cloud_print/print_system_dummy.cc" ]
   }
 }